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Cores Grade-5 Porcelain Dry. Zero Walking.

Cosari TileCore-X10

Start dead center with the carbide cross-spear, then core through in about 25 seconds with the wax-cooled diamond bit.

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  • 5 anchor sizes, 2 bits each: 3/16" to
  • 4-blade carbide tip starts on the mark, zero
  • Internal cooling wax lets you drill 100% dry
  • 1/4" hex shanks fit any cordless drill
Cosari TileCore-X10
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Built for the Tile That Melts Ordinary Bits

Modern porcelain is harder than granite. This kit handles it in two steps.

Zero-Walk Cross-Spear

Four tungsten-carbide cutting edges grip glossy glaze on the first rotation and score a clean starter dimple right on your pencil mark.

Wax-Cooled Diamond Core

Solid paraffin inside each barrel softens at 140°F and cools the vacuum-brazed diamond crown, so you can drill dry on vertical walls.

Quick-Change Hex Shank

1/4-inch hex shanks lock into 3-jaw and quick-change chucks without spinning, even under load.

Every Anchor Size

3/16", 1/4", 5/16", 3/8", and 1/2" in both carbide and diamond. Towel bars, grab bars, and shower hinges, all from one case.

How It Cuts Porcelain Without Cracking It

Score the Glaze

Score the Glaze

The bronze 4-blade cross-spear bites into the slick surface and cuts a 2mm dimple without drifting off your mark.

Core Through Dry

Core Through Dry

The diamond bit seats in the dimple. As friction builds, the internal wax softens and cools the rim while you cut through 10mm porcelain.

Finish Into the Wall

Finish Into the Wall

Pop out the tile plug through the side slot, then switch back to the carbide bit to drill into the stud or backer board.

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Cosari TileCore-X10

10-Piece Carbide & Wax-Cooled Diamond Tile Bit Set for Porcelain, Ceramic, Marble & Glass

Backed by our 30-Day Money-Back Trial & Full 2-Year Cosari Warranty.

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Description

Why two types of bits?: Hollow diamond bits cut porcelain fast but skate at startup. Carbide spear bits start precisely but burn out on dense porcelain. Using the carbide to start and the diamond to finish gives you a clean, centered hole every time.

What surfaces can I drill?: PEI Grade-5 and through-body porcelain, glazed ceramic, marble, granite-look tile, and annealed glass. Do not drill tempered glass.

Drill settings: Rotary mode only (hammer off), 1,500 to 2,500 RPM, light pressure, and a small circular wobble on the diamond bit so dust can clear the cut.

Shipping & 30-Day Returns

Free Shipping: Every order ships free with full tracking within 24 hours.

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 TileCore-X10?

Cosari TileCore-X10 Detail

Two-Stage Hybrid System

A carbide twin for every diamond bit, so you start centered and finish into the backing without clogging the core.

Thermal Burnout Protection

Internal wax keeps the diamond rim cool enough to avoid the melted tips and burn rings common with dry carbide bits.

Crack-Free Results

Controlled starts and lower heat put less stress on tile that's already set in mortar. Your waterproofing stays intact.

Cosari TileCore-X10 vs. Ordinary Alternatives

Cosari TileCore-X10Standard Competitors

FeatureCosari TileCore-X10Standard Competitors
Starting on glossy vertical tileCarbide cross-spear bites on the markHollow bits skate or need angle-starting
Cooling on a shower wallBuilt-in wax, fully dryWater spray or wet sponge needed
1/4" hole in Grade-5 porcelainAbout 25 secondsSeveral minutes or a melted tip
Sizes in the box5 sizes, 10 bitsOne size per package
Total cost$24.99 for the set$105 to $125 for 5 single diamond bits
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What's Included

In the Box
  • 1 × Set of 5 Tungsten-Carbide 4-Blade Cross-Spear Bits (3/16", 1/4", 5/16", 3/8", 1/2")
  • 1 × Set of 5 Wax-Filled Vacuum-Brazed Diamond Core Bits (3/16", 1/4", 5/16", 3/8", 1/2")
  • 1 × Slide-Lock Storage Case with Size Markings
Technical Specifications
  • Bit Count: 10 (5 carbide cross-spear + 5 diamond core)
  • Sizes: 3/16" (5mm), 1/4" (6mm), 5/16" (8mm), 3/8" (10mm), 1/2" (12mm)
  • Shank: 1/4-inch (6.35mm) hex, quick-change compatible
  • Carbide Grade: YG6X tungsten carbide, 4-blade cross head
  • Diamond: Vacuum-brazed #35/40 grit with side ejection slot
  • Cooling: Solid internal paraffin wax, activates at 140°F (60°C)
  • Recommended Speed: 1,500–2,500 RPM, rotary mode only
  • Materials: Porcelain (PEI-5), ceramic, marble, annealed glass
Care & Safety
  • Wipe dust off each bit after use and store it in its marked slot so diamond rims don't knock against each other. Clear any trapped tile plug through the side slot before the next hole.
  • Never use hammer mode or heavy pressure. If cutting slows, back out, let the bit cool for a minute, and resume with a light circular wobble. On thick stone, a drop of water extends bit life.
  • Backed by our 30-Day Money-Back Guarantee & 2-Year Warranty
  • Customer Support: support@buycosari.com
In the Box Cosari TileCore-X10

Mount Your Hardware in 3 Steps

Swipe left for steps 2 and 3

  1. Chuck Up & Set Rotary
    1

    Chuck Up & Set Rotary

    Snap the carbide cross-spear bit into your drill and set the collar to standard rotary mode, hammer off.

  2. Dimple, Then Core
    2

    Dimple, Then Core

    Score a 2mm dimple on your mark, switch to the diamond bit, and core through dry with a light circular wobble.

  3. Anchor & Mount
    3

    Anchor & Mount

    Tap your wall anchor into the clean hole and screw your bracket, grab bar, or towel rack in place.

Verified Customer Reviews

What 200+ Verified Buyers Say About the Cosari TileCore-X10

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Based on 247 verified reviews
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97% of buyers recommend the Cosari TileCore-X10
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Marcus V.2 days ago

22 seconds per hole on Grade-5 porcelain after a standard bit failed

I spent 30 minutes leaning into a brand-new hardware store glass-and-tile bit on one shower hole and barely scratched the glaze. Used the bronze 4-blade cross-spear tip in this Cosari set to dimple the mark on my painter's tape, switched to the matching 1/4-inch wax diamond bit, and punched cleanly through Grade-5 rectified porcelain in 22 seconds flat. Zero skating on a vertical wall and no messy water spray bottle required.

Verified Purchase · Scottsdale, AZ · Cosari TileCore-X10

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Derek H.5 days ago

Whoever paired these two bit styles together actually installs hardware

The combination of carbide starter bits AND wax-filled diamond core bits in the exact same sizes (3/16" up to 1/2") is pure genius. Once you break through the hard porcelain tile with the black diamond bit, you switch back to the matching bronze carbide bit to drill into the cement backer board or drywall behind it so you don't clog the diamond tube. And the 1/4-inch hex shanks lock right into my DeWalt chuck without spinning.

Verified Purchase · Naperville, IL · Cosari TileCore-X10

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Pauline & Greg T.1 week ago

Zero spalling on $45 large-format shower slabs

I was terrified of cracking our large-format marble-look porcelain slabs while mounting frameless shower door hinges and two towel bars. Eight 5/16-inch holes later, every single edge looks laser-cut with zero chipping or spalling. Pro tip: run your drill on high speed (around 2,000 RPM) and wobble the diamond bit in a tiny circular motion once you're in the groove.

Verified Purchase · Raleigh, NC · Cosari TileCore-X10

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Kenji S.1 week ago

Internal cooling wax works like a charm for dry drilling

You can literally see the internal wax melting just enough to keep the diamond grit cool while cutting completely dry. I drilled 12 holes for two stainless ADA grab bars in my parents' tiled shower and the 1/4-inch bit still has plenty of life left. The side ejection slot on the black barrels makes popping out the little porcelain core plug with a small flathead screwdriver take two seconds.

Verified Purchase · Tacoma, WA · Cosari TileCore-X10

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Brian M.2 weeks ago

Whole 10-piece kit cost what the big-box store wanted for ONE diamond bit

My local home improvement store wanted $22 for a single 1/4-inch diamond hole saw. This Cosari set gave me 5 diamond core bits plus 5 cross-blade carbide bits covering every common plastic wall anchor and toggle bolt size. Saved me a $225 handyman minimum charge just to hang our vanity mirror, toilet paper holder, and heated towel rack.

Verified Purchase · Fort Worth, TX · Cosari TileCore-X10

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Elena R.2 weeks ago

No more walking off the pencil mark

Standard two-wing spear bits always skate an eighth of an inch off my mark on glossy ceramic backsplash tile. The 4-blade cross-head on these bronze bits bites dead center on the very first rotation. Even my husband, who usually hates tiling projects, was impressed by how clean the holes came out.

Verified Purchase · Tampa, FL · Cosari TileCore-X10

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Tom K.3 weeks ago

Follow the high-RPM + slight wobble advice and they fly through tile

At first I pressed too hard on low speed out of habit and thought the diamond bit was slow. Once I switched my cordless drill to Gear 2 (high RPM), lightened my pressure, and gave the diamond crown a slight 15-degree circular rock like the instructions say, it cut through 10mm porcelain like butter. Knocking off half a star only because I wish it included a 3/8" size in addition to the 5/16" and 1/2", though those five sizes covered all my anchors.

Verified Purchase · Columbus, OH · Cosari TileCore-X10

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Sonia D.3 weeks ago

Bonus use: perfect drainage holes in thick glazed ceramic planters!

After we finished hanging our bathroom shelves, I used the 1/2-inch wax diamond bit to drill drainage holes in the bottoms of six thick glazed ceramic patio pots. Went through all six in under three minutes without cracking a single pot. Worth every penny.

Verified Purchase · Sacramento, CA · Cosari TileCore-X10

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Chris L.1 month ago

Clean cuts on subway tile and porcelain floor tile alike

Used the 3/16" and 1/4" pairs to mount a floating glass shelf and a doorstop into our porcelain bathroom floor. Having the carbide bit to start the dimple and finish the subfloor hole keeps the diamond bit sharp strictly for the hard tile layer. Smartest drill bit set in my toolbox.

Verified Purchase · Marietta, GA · Cosari TileCore-X10

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Arthur W.1 month ago

Zero cracked tiles on a floor-to-ceiling remodel

Our contractor tiled our bathroom floor-to-ceiling in hard gray porcelain and left the accessories for me to install. I was dreading drilling 16 holes. The Cosari TileCore-X10 made it completely stress-free—every anchor sat flush because the hole edges didn't blowout.

Verified Purchase · Boise, ID · Cosari TileCore-X10

Finish the Bathroom Tonight. Not Next Weekend.

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Frequently Asked Questions

Do I need water to cool these bits?

No. Each diamond core bit is pre-filled with solid paraffin wax that softens at about 140°F and cools the cutting edge as you drill, so vertical walls stay clean and dry. On very thick natural stone, a single drop of water can extend bit life further.

What sizes are included?

You get two bits in each of five sizes: one carbide cross-spear bit and one diamond core bit in 3/16", 1/4", 5/16", 3/8", and 1/2". That covers standard plastic wall anchors and most toggle bolts.

How do I stop the diamond bit from skating on glossy tile?

Score a 1 to 2mm dimple first with the matching carbide cross-spear bit, then seat the diamond bit in it. If you skip the starter, angle the diamond bit at about 45° and rock it upright once it bites.

Will these fit my cordless drill?

Yes. Every bit has a 1/4-inch hex shank that fits standard 3-jaw drill chucks and quick-change hex chucks from DeWalt, Milwaukee, Ryobi, Makita, and others.

Should I use hammer mode?

Never. Hammer mode will crack porcelain and damage the diamond rim. Set your drill to standard rotary mode, run 1,500 to 2,500 RPM, and use light pressure with a small circular wobble.

What do I do after I'm through the tile?

Switch back to the carbide cross-spear bit in the same size to drill into the stud, drywall, backer board, or mortar behind the tile. This keeps the diamond tube from packing with debris.

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