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One Steel Piece. Zero Rubber to Rot.

Cosari ChefBox 304

Shreds a cold 8-oz block of cheddar in 32 seconds, slices potatoes for gratin, and goes on the bottom dishwasher.

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  • 100% 304 Stainless, Zero Plastic or Rubber
  • Teardrop, Medium, Star Rasp & 3-Blade Slicer
  • Wide Pyramid Base That Won't Flex
  • Bottom-Rack Dishwasher Safe
Cosari ChefBox 304
Free Tracked Shippingin 5 to 7 business days
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Built Like a Prep-Kitchen Tool

Four cutting faces, one solid piece of steel, and nothing on it that can crack, peel or hold water.

4 Faces, 1 Stable Box

Coarse, medium, fine rasp and a three-blade slicer on a wide 14-degree tapered base that sits flat on your board.

Teardrop Holes That Slice

Sharp teardrop edges cut cold cheddar and mozzarella into fluffy strands instead of mashing them into paste.

Mirror-Polished 304 Steel

Food-grade stainless on every wall, the handle and the brackets. No coatings or trim to wear off.

10-Second Cleanup

Rinse under hot water or put it on the bottom rack. The sealed handle has no hollow cap to fill with dishwater.

How the ChefBox 304 Works

Grip and Glide

Grip and Glide

Wrap four fingers around the tubular handle and push the cheese down the teardrop face with light strokes. The edges face up, so each stroke cuts a clean ribbon.

Slice on the Side

Slice on the Side

Run a potato or cucumber across the three horizontal blades for even, thin slices that drop straight into the wide interior.

Rinse and Rack It

Rinse and Rack It

Hot water runs straight off the polished steel. There are no rubber seams or plastic caps to trap cheese or water.

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Excellent4.8 (247)Trustpilot

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Cosari ChefBox 304

All-Stainless 4-Sided Box Grater, Mirror-Polished 304 Steel

Backed by our 30-Day Money-Back Trial & Full Cosari Guarantee.

$29.99 $59.99 Free Tracked Shipping (5–7 Days) Included

In Stock: Delivers in 5–7 Business Days. Free insured US delivery with tracking.

30-Day Money-Back Guarantee plus a full 2-Year Warranty.

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Description

Why all stainless?: Plastic frames crack and rubber feet go sticky and trap dishwater. The ChefBox 304 is one material from top to bottom, so there's nothing to peel, crack or leak onto your food.

Why the pyramid shape?: The walls taper out at about 14 degrees to a wide base. Pressing down keeps it planted on the board, and the bigger interior holds more cheese before it spills out.

Who is it for?: Home cooks who buy block cheese, make pizza, gratins and mac and cheese, and want one grater that will last for years.

5–7 Day Shipping & 30-Day Returns

Free 5–7 Day US Shipping: Every order ships free with full tracking and delivers in 5 to 7 business days.

30-Day Trial: Try it at home for 30 days risk-free. Need help? Email us anytime at support@buycosari.com.

2-Year Warranty: If anything goes wrong within 2 years, we replace it free of charge or refund your order in full.

Why Choose the Cosari ChefBox 304?

Cosari ChefBox 304 Detail

No Rubber, No Rot

No rubber gaskets or plastic trim means nothing goes sticky, cracks, or drips brown water onto fresh cheese.

0.8mm Walls That Hold

Heavy-gauge steel walls don't pop inward when you press a cold block or a wedge of aged Parmigiano against them.

A Handle That Fits Your Hand

The round tubular bar on flared brackets leaves room for all four fingers, with no thin metal strip digging into your palm.

Cosari ChefBox 304 vs. Ordinary Alternatives

Cosari ChefBox 304Standard Competitors

FeatureCosari ChefBox 304Standard Competitors
Materials100% 304 stainless steelSteel panels with plastic frames and rubber parts
8-oz cold cheddar32 seconds, fluffy ribbonsSlower, more arm effort
Cold mozzarellaClean, separate strandsOften smears into paste
After 15 dishwasher cyclesNo trapped water or rustWater in seams, caps or rubber feet
Price$29.99 today (50% off)$35 to $40
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What's Included

In the Box
  • 1 × Cosari ChefBox 304 Mirror-Polished Stainless Steel 4-Sided Box Grater
  • 1 × Protective Kraft Storage Carton
  • 1 × Printed Care Card
Technical Specifications
  • Material: 304 food-grade stainless steel, mirror-polished
  • Wall thickness: 0.8mm heavy gauge
  • Dimensions: approx. 9.2" tall (with handle) × 5.5" × 4.3" base
  • Faces: coarse teardrop, medium-fine, fine star rasp, 3-blade horizontal slicer
  • Base: open all-metal, 14-degree tapered wide stance
  • Handle: 28mm-clearance tubular steel bar on flared metal brackets
  • Cleaning: bottom-rack dishwasher safe, heated dry OK
  • Lab benchmark: 32 seconds per 8-oz cold cheddar block
Care & Safety
  • Rinse under hot water right after use, before cheese dries, and wipe in the direction of the blades to protect your sponge.
  • Dishwasher safe on the bottom rack. Use on a wood or plastic cutting board, not directly on marble or glass.
  • Backed by our 30-Day Money-Back Guarantee & Full Cosari Warranty
  • Customer Support: support@buycosari.com
In the Box Cosari ChefBox 304

Fresh Cheese in 3 Steps

Swipe left for steps 2 and 3

  1. Plant and Grip
    1

    Plant and Grip

    Set the wide base flat on your cutting board and wrap your hand around the tubular handle.

  2. Glide and Shred
    2

    Glide and Shred

    Push the cheese down the teardrop face in smooth strokes. The wide interior catches the ribbons.

  3. Lift and Rinse
    3

    Lift and Rinse

    Lift the grater straight up to reveal the pile, then rinse for 10 seconds or put it in the dishwasher.

Verified Customer Reviews

What 200+ Verified Buyers Say About the Cosari ChefBox 304

Excellent Trustpilot
4.8
Based on 247 verified reviews
5 Stars
212
4 Stars
25
3 Stars
7
2 Stars
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1 Star
1
97% of buyers recommend the Cosari ChefBox 304
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✓ Verified Purchase
Lauren M.2 days ago

Finally—ZERO rubber trim or hollow plastic handles to trap nasty water!

I threw away my expensive name-brand grater last week because the hollow plastic-capped handle filled up with nasty dishwasher water and leaked brown rusty liquid right onto freshly grated mozzarella. All I wanted for years was a heavy-gauge, 100% stainless steel box grater with NO plastic frame to crack and NO rubber gasket to get slimy. The Cosari ChefBox 304 is pure mirror-polished steel from top to bottom. The teardrop holes are scary sharp—cold Monterey Jack and low-moisture mozzarella come out in clean, fluffy ribbons in 20 seconds.

Verified Purchase · Austin, TX · Cosari ChefBox 304

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Mark D.4 days ago

Doesn't cave in when you push hard block cheddar against it

My cheap grocery store grater used to cave inward with a loud pop every time I pressed a cold block of sharp cheddar against it, turning taco night into a forearm workout. This Cosari 304 steel is thick and completely rigid. Even without a rubber foot, the wide pyramid base sits dead flat on my wood cutting board and holds a huge pile of cheese inside without spilling out the sides. Tossed it straight on the bottom rack of the dishwasher after dinner and it came out gleaming.

Verified Purchase · Columbus, OH · Cosari ChefBox 304

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Jenna R.1 week ago

Way better than those viral rotary crank graters

I bought one of those viral rotary hand-crank graters on TikTok and hated it—the suction cup pops off my quartz counter mid-crank and you have to wash five bulky plastic pieces just for mac and cheese. Went back to basics with the ChefBox 304 and couldn't be happier. One solid piece of steel, shreds an 8oz block of Tillamook in under 30 seconds, and rinses clean under hot water in ten seconds flat.

Verified Purchase · Scottsdale, AZ · Cosari ChefBox 304

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David K.1 week ago

No more sticky black rubber flecks on my cutting board

On my old box grater, water and old cheese gunk got trapped permanently inside the black rubber bottom trim. After six months of the dishwasher, the rubber got sticky and started leaving black flecks on my butcher block. Having a bare, smooth, rolled stainless steel bottom edge on the Cosari is a massive upgrade. Nothing to detach, nothing to rot, and it doesn't scratch my walnut board.

Verified Purchase · Naperville, IL · Cosari ChefBox 304

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Stephanie W.2 weeks ago

The 3 slicing blades on the side are a sleeper hit

Everyone talks about the coarse shredding side, which is fantastic, but those three horizontal slicing blades on the side panel are a sleeper hit. I sliced two whole English cucumbers for salad and half a block of aged white cheddar for crackers in twenty seconds without having to dig out my bulky mandoline. The round tubular handle on top also fits all four fingers comfortably instead of digging into your palm.

Verified Purchase · Raleigh, NC · Cosari ChefBox 304

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Chris P.2 weeks ago

Stopped buying bagged cellulose cheese forever

Once you grate your own block cheddar in 30 seconds on this thing and see how smooth your homemade mac and cheese melts without that gross wood-pulp coating they put on bagged shreds, you can never go back. The mirror finish on the 304 steel is so slick that cold cheese glides right across the blades without sticking or mushing into a paste.

Verified Purchase · Nashville, TN · Cosari ChefBox 304

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Brian T.3 weeks ago

Super sharp and solid—just watch your knuckles!

Giving this 5 stars for build quality and 4 stars only as a warning: the etched/punched teeth on this are WAY sharper than the dull stamped graters from big-box stores. There is zero resistance when shredding hard Parmesan or cold butter for biscuits, so go slow when you get down to the end of the block. Built like a commercial restaurant tool.

Verified Purchase · Tacoma, WA · Cosari ChefBox 304

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Amanda H.3 weeks ago

Doesn't shred my kitchen sponge into yellow confetti

Because the steel is mirror-polished, if you rinse it upside down under hot tap water right after grating, 95% of the cheese slides right off. When I wipe down the inside or go with the grain on the outside, it cleans right up instead of gripping and shredding my Scotch-Brite sponge into yellow confetti like my old dull tin grater did.

Verified Purchase · Tampa, FL · Cosari ChefBox 304

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Eleanor G.1 month ago

Frozen butter for scones and pie crust in 15 seconds

I bake a lot of sourdough biscuits and pie crusts, and grating frozen sticks of butter on a flimsy grater is miserable because the metal walls flex inward. The 0.8mm walls on the ChefBox 304 don't budge at all. It turns a rock-hard stick of frozen Kerrygold into uniform little curls in 15 seconds before the butter can warm up in my hands.

Verified Purchase · Portland, ME · Cosari ChefBox 304

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Robert S.1 month ago

Buy-it-for-life kitchen hardware

At 50% off, this is a no-brainer. It feels hefty in the hand, the spot welds on the flared handle brackets are super clean, and there isn't a single gram of silicone or ABS plastic anywhere to degrade over time. My grandkids will probably still be grating potatoes for hashbrowns on this exact piece of steel.

Verified Purchase · Minneapolis, MN · Cosari ChefBox 304

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Frequently Asked Questions

Is the Cosari ChefBox 304 really dishwasher safe?

Yes. It's 100% 304 stainless steel with a sealed tubular handle, so it can go on the bottom rack with heated dry. After 15 sanitize cycles in our test, no water or rust came out when we tilted it.

Will it slide around without a rubber base?

On a wood or plastic cutting board, no. The base flares out at about 14 degrees, so downward pressure pins it flat. We don't recommend using it directly on polished marble or glass.

What are the four sides used for?

Coarse teardrop holes for cheddar and mozzarella, three horizontal slicing blades for potatoes, cucumbers and cheese slices, a medium-fine shredder for hash browns and frozen butter, and a fine star rasp for Parmesan, Romano and nutmeg.

How big is it? Will it fit in my cabinet?

It measures roughly 9.2 inches tall including the handle, with a 5.5 by 4.3 inch base. It stands upright on a standard lower cabinet shelf.

Do the walls bend when grating hard cheese or frozen butter?

The walls are 0.8mm heavy-gauge stainless steel joined into a four-corner pyramid. In our 15-lb compression test it showed the least flex of any grater in our top five.

What if I don't like it?

You have 30 days to try it. If it doesn't cut your grating time and make cleanup easier, send it back for a full refund. Shipping is free and tracked.

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