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Your Dull Bits Cut Steel Again

Cosari EdgePro

Drop a dull bit in the matching port, give each flute 5 seconds on the diamond wheel, and it bites.

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  • ✓ Fits 2mm–13mm (5/64" to 1/2") Twist Bits
  • ✓ 118° & 135° Dual-Angle Guide Ports
  • ✓ Industrial Diamond Wheel, Never Grooves
  • ✓ Sharpens HSS, Cobalt & Carbide in 10s
Cosari EdgePro
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Built to Fix the Part Cheap Sharpeners Get Wrong

A bit only cuts when the edge sits higher than the heel. Every part of the EdgePro is designed around getting that right on the first try.

19 Graduated Sizing Ports

Precision-molded ports from 2mm to 13mm (5/64" to 1/2") in 0.5mm–1mm steps. Match the bit to the hole and it seats at the right depth every time.

118° & 135° Dual-Angle Guides

Use 118° for wood, aluminum and mild steel. Switch to 135° for cobalt, stainless and hard alloys. Both angles are built into the faceplate.

150-Grit Diamond Wheel

Industrial diamond electroplated on a flat steel wheel. It stays flat, doesn't groove and is rated for 1,200+ sharpenings.

Automatic 8° Lip-Relief Cam

An internal flute stop in every port holds the bit at 8° of relief, so the cutting lip always clears the heel. No charts, no calipers.

How the EdgePro Restores a Factory Edge

Match the Bit to Its Port

Match the Bit to Its Port

Pick the port that matches your bit size. The 19 graduated holes run from 2mm to 13mm, so there's no measuring or guessing.

The Flute Stop Sets the Relief

The Flute Stop Sets the Relief

Rotate the bit until the flute catches the internal stop. That locks it at 8° of relief against the flat diamond wheel, so the lip ends up higher than the heel.

Drill and Watch the Curls

Drill and Watch the Curls

Five seconds per flute, then drill. A correctly sharpened bit pulls two matching silver curls out of steel with light pressure.

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Excellent4.8 (247)Trustpilot

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Cosari EdgePro

Diamond-wheel drill bit sharpener jig for 2mm–13mm HSS, cobalt and carbide twist bits. Runs off the drill or angle grinder you already own.

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

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

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Description

Description: The Cosari EdgePro is a compact drill bit sharpener jig with 19 graduated guide ports for 2mm–13mm twist bits, dual 118° and 135° angle guides, and a 150-grit electroplated diamond wheel. Each port sets 8° of lip relief automatically. It is driven by a standard cordless drill or 115mm/125mm angle grinder and works on HSS, titanium-coated, cobalt and carbide bits.

Shipping & Returns: Free tracked shipping on every order. If the EdgePro doesn't restore your bits to your satisfaction within 30 days, return it for a full refund.

Warranty: Every unit is covered by a 2-year Truemark workshop replacement warranty against defects in materials and workmanship.

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 EdgePro?

Cosari EdgePro Detail

10 Seconds Per Bit

About 5 seconds per flute. A full drawer of dull bits takes an afternoon coffee break, not a weekend.

Twin Curls, Every Time

Matched lips mean both flutes cut evenly, so you get two clean steel ribbons instead of smoke and squealing.

2-Year Workshop Warranty

Glass-reinforced PA66 nylon body and a replaceable diamond wheel, backed by a 2-year replacement warranty.

Cosari EdgePro vs. Ordinary Alternatives

Cosari EdgeProStandard Competitors

FeatureCosari EdgeProStandard Competitors
Sets lip relief automaticallyYes, fixed 8° in every portOften no relief, heel rubs
Grinding surface150-grit diamond on steelSoft stone that grooves
Setup before first bitUnder 1 minute, no chuckChuck alignment or freehand skill
PowerYour existing drill or grinderDedicated outlet and motor
Price$24.99$60–$180 for motorized units
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What's Included

In the Box
  • 1 × Cosari EdgePro Multi-Angle Drill Bit Sharpener Jig (2mm–13mm) with Pre-Installed 150-Grit Diamond Wheel
  • 1 × Replacement 150-Grit Electroplated Diamond Grinding Disc
  • 1 × Drive Arbor & Lock-Nut Wrench Set
  • 1 × Illustrated Angle & Bit Sizing Reference Guide
Technical Specifications
  • Bit Range: 2mm–13mm (5/64" to 1/2") twist bits
  • Guide Ports: 19 graduated ports in 0.5mm–1mm increments
  • Point Angles: 118° and 135°
  • Lip Relief: Fixed 8° automatic relief
  • Abrasive: 150-grit electroplated industrial diamond on steel wheel, rated 1,200+ sharpenings
  • Compatible Bits: HSS, titanium-coated, M35/M42 cobalt, carbide
  • Drive: Cordless drill or 115mm/125mm angle grinder via drive arbor
  • Body & Size: Glass-reinforced PA66 nylon, 145 × 72 × 38mm, 265g
Care & Safety
  • Brush metal dust out of the ports and sharpening window after each session. A dry toothbrush works well. Don't use oil or water on the diamond wheel.
  • To change the wheel, remove the drive tool's battery or unplug it, release the center lock nut with the included wrench, and swap the disc. It takes about 15 seconds.
  • Backed by our 30-Day Money-Back Guarantee & 2-Year Warranty
  • Customer Support: support@buycosari.com
In the Box Cosari EdgePro

Sharp in 3 Steps

Swipe left for steps 2 and 3

  1. Connect Your Drill or Grinder
    1

    Connect Your Drill or Grinder

    Couple the EdgePro to your cordless drill or 125mm angle grinder through the drive arbor. Takes about 5 seconds.

  2. Insert the Bit, 5 Seconds Per Flute
    2

    Insert the Bit, 5 Seconds Per Flute

    Put the fluted tip into the matching port, rotate until the flute catches the stop, and grind 5 seconds. Turn and repeat on the other flute.

  3. Drill Steel Again
    3

    Drill Steel Again

    Chuck the bit and drill. It should bite immediately and pull two clean silver curls with light pressure.

Verified Customer Reviews

What 200+ Verified Buyers Say About the Cosari EdgePro

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Based on 247 verified reviews
5 Stars
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25
3 Stars
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97% of buyers recommend the Cosari EdgePro
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✓ Verified Purchase
Alex M.1 week ago

Pulled twin steel ribbons out of 1/4-inch angle iron on the first try

I have three DeWalt cases where the 1/8, 3/16, and 1/4 bits are completely smoked, and I refused to buy a fourth full set just to get three sharp bits. Hooked the Cosari EdgePro up, dropped a smoked 3/8 bit into the port for five seconds per flute, and tested it on 1/4-inch angle iron without a pilot hole. It bit immediately and pulled twin steel ribbons right out of the hole.

Verified Purchase · Austin, TX · Cosari EdgePro

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✓ Verified Purchase
Alex M.1 week ago

Way faster than a $180 bench machine and zero plastic chuck alignment

I didn't want to spend $180 on a bulky dedicated machine or deal with that annoying plastic alignment chuck every time I need to touch up a 1/4-inch bit. The internal flute stop inside each hole on the EdgePro is the secret—it automatically locks the bit so you get actual back-clearance instead of a flat cone. Fits right in my tool chest drawer next to my drill index.

Verified Purchase · Austin, TX · Cosari EdgePro

✓ Verified Purchase
Alex M.1 week ago

Sharpened a whole coffee can of my dad's 40-year-old USA Hanson bits

My dad left me a coffee can of 40-year-old USA-made Hanson bits that were all dull or blued at the tips. Sharpening the whole can in half an hour felt like printing $200 in my garage. If you can put a round peg in a labeled hole and count to five, you can put a factory edge back on a twist bit with this jig.

Verified Purchase · Austin, TX · Cosari EdgePro

✓ Verified Purchase
Alex M.1 week ago

Breathed life right back into my M35 cobalt bits

Used it on my M35 cobalt bits that were skating across stainless steel brackets. Those cheap hex-shank pink stones wear a deep groove after three bits and leave the heel higher than the cutting lip so the bit just rubs and smokes. Five seconds per side on this electroplated diamond wheel and my cobalt bit bit right into the center punch mark.

Verified Purchase · Austin, TX · Cosari EdgePro

✓ Verified Purchase
Alex M.1 week ago

Saved my small bits that I can't see well enough to freehand anymore

Freehanding a 1/2-inch bit on a bench grinder is easy enough, but anything under 1/4-inch is impossible for my eyes now. The tiny indexed ports on the Cosari EdgePro saved dozens of my 1/8 and 5/32 bits that I used to just toss in the trash once they dulled.

Verified Purchase · Austin, TX · Cosari EdgePro

✓ Verified Purchase
Alex M.1 week ago

Saved a 30-minute round trip to the hardware store on Sunday night

Dulled my only 5/16 bit halfway through mounting a trailer hitch frame on a Sunday evening. Took maybe 15 seconds with the EdgePro to put a fresh point back on it and punched through the remaining four frame holes cleaner than when I started.

Verified Purchase · Austin, TX · Cosari EdgePro

✓ Verified Purchase
Alex M.1 week ago

Diamond disc stays dead flat without trenching

Because the grinding disc is electroplated diamond on solid steel instead of a soft vitrified stone, it never wears a trench or loses its flat geometry. I've run at least 60 bits through mine so far—including some masonry carbide tips I needed to clean up—and the wheel still looks barely touched.

Verified Purchase · Austin, TX · Cosari EdgePro

✓ Verified Purchase
Alex M.1 week ago

Works great on standard twist bits up to 1/2 inch

Does exactly what it claims on standard jobbers from 5/64 up to 1/2 inch. One tip: if you have a bit that snapped completely off at a jagged angle, grind the stub flat for two seconds before sticking it in the port so the flute stop indexes evenly. Once it's in the port, the relief angle comes out spot on.

Verified Purchase · Austin, TX · Cosari EdgePro

✓ Verified Purchase
Alex M.1 week ago

No more smoking bits in hardwood or mild steel

I used to push harder and harder on my drill press when a bit got dull until the work started smoking. Touching up the cutting lips with the EdgePro before a project takes ten seconds and the bit feeds itself with minimal pressure.

Verified Purchase · Austin, TX · Cosari EdgePro

✓ Verified Purchase
Alex M.1 week ago

Paid for itself in the first 15 minutes

Grabbed this while it was 50% off and went straight through my drill index. Brought back six 1/4-inch and four 3/8-inch cobalt bits that would have cost me $65 to replace individually. Dead simple design that actually gets the heel clearance right.

Verified Purchase · Austin, TX · Cosari EdgePro

Bring Your Coffee Can of Dull Bits Back to Work

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Frequently Asked Questions

Does the Cosari EdgePro actually grind lip relief, or just a pointed cone?

It grinds real relief. Each of the 19 ports has an internal flute stop that holds the bit at a fixed 8° relief angle against the diamond wheel, so the cutting lip always sits higher than the heel. We confirmed matched lips and clean heel clearance under a digital microscope.

What bit sizes does it fit?

Standard twist bits from 2mm to 13mm, which covers imperial sizes from 5/64 inch to 1/2 inch. It does not sharpen spade bits, Forstner bits or step drills.

Can it sharpen cobalt and carbide bits?

Yes. The wheel is 150-grit industrial diamond electroplated on steel, which cuts M35 and M42 cobalt and carbide. We ran 120 cycles, including cobalt and carbide, and found no groove in the wheel.

What do I need to power it?

A standard cordless drill or a 115mm/125mm angle grinder. The jig connects through its drive arbor. There is no power cord on the jig itself.

How long does each bit take?

About 10 seconds: roughly 5 seconds per flute. Our flat-ground 1/4-inch cobalt test bit took 12 seconds from completely dead to cutting.

What if it doesn't work on my bits?

You have 30 days to run your worst bits through it. If they don't bite into steel and pull clean curls, send it back for a full refund. Every unit also carries a 2-year Truemark workshop replacement warranty.

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