How brittle are these? I want to put one in my edc pouch that rides around in my cargo pocket. Will they snap easily if bumped or flexed?

I don't think there is any danger of snapping the Dia-Sharp card by accident (or on purpose, for that matter). The substrate appears to be steel, about 1.5x the thickness of a credit card, with the finishing surface diamond-impregnated.

Has anybody tried cutting these in half....to potentially double your usage time?.otherwise, i find the middle doesnt get used, just the edges. ThankS

Never have tried to cut them in half. Haven't experienced your problem with wear either. love these little stones. They do wear out though.

Is there any abrasive on the card edges?

Just had a look at mine--nope, no abrasive on the edge--the cards are really thin, so I don't there really could be, anyway.

Can the cards be modified in any way? Like cutting down to size or drilling holes through them to attach to a lanyard or camping bag?

They are just metal cards with an adhesive matrix that diamond chips are embedded into. You can cut or drill them as you want, but be careful so as to not knock the diamond chips loose from the card.

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Diamond Machining Technology (DMT) Dia-Sharp Diamond Sharpening Stone Credit Card, Extra Fine, Fine & Coarse, 3 Pack

Diamond Machining Technology (DMT) Dia-Sharp Diamond Sharpening Stone Credit Card, Extra Fine, Fine & Coarse, 3 Pack

Product ID: 6003235

Details

Brand
DMT (Diamond
Color
Blue Clear Red
Global Trade Identification Number
Grit Type
Coarse Fine
Item Weight
0.32 Ounces
Manufacturer
DMT

🎨Color-coded grit for easy ID

👜Credit card-sized, pocket-ready

💎Micronized monocrystalline diamond surface

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Bs.634

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In stock

Sold byAmazon BoliviaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
DMT (Diamond
Color
Blue Clear Red
Global Trade Identification Number

Description

💼 Sharpen like a pro, anywhere you go — your edge, your power.

RAZOR SHARP HONING - Fine 25 micron stone perfects your cutting edge
MESS FREE SHARPENING - Sharpen dry or with water—no oils, no hassle
ULTIMATE PORTABILITY - Slim 3.25" x 2" stones fit effortlessly in your wallet or pocket
MIRROR POLISHED FINISH - Extra-fine 9 micron stone polishes to perfection
PRECISION EDGE RESTORATION - Coarse 45 micron stone revives dull blades fast

The DMT Dia-Sharp 3-pack features credit card-sized diamond sharpening stones in coarse, fine, and extra-fine grits (45, 25, and 9 microns) with a durable monocrystalline diamond surface. Designed for professionals and enthusiasts alike, this portable kit fits in your wallet and sharpens quickly without oils, delivering consistent, precision edges anytime, anywhere.

Specifications

ASIN	B00006IIO3
Best Sellers Rank	#28,840 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #44 in Sharpening Stones
Brand	DMT (Diamond Machining Technology)
Brand Name	DMT (Diamond Machining Technology)
Color	Blue, Clear, Red
Customer Reviews	4.6 out of 5 stars 1,210 Reviews
Global Trade Identification Number	00017042007546
Grit Type	Coarse,Extra-fine,Fine
Included Components	DMT D3EFC 3-inch Dia-Sharp Sharpener, Credit Card Sized- Extra-Fine, Fine and Coarse Diamond -Set of 3
Item Dimensions L x W x H	3.25"L x 2"W x 0.05"H
Item Type Name	DMT D3EFC 3-inch Dia-Sharp Sharpener, Credit Card Sized- Extra-Fine, Fine and Coarse Diamond -Set of 3
Item Weight	0.32 Ounces
Manufacturer	DMT
Manufacturer Part Number	D3EFC
Manufacturer Warranty Description	Manufacturer Warranty
Material	Micronized Monocrystalline Diamond
Material Type	Micronized Monocrystalline Diamond
Model Number	D3EFC
Number of Items	3
Product Dimensions	3.25"L x 2"W x 0.05"H
UPC	735090243289 017042007546 798167684781
Unit Count	1.0 Count

Reviews

K**7

28.09.2014

K**R

15.01.2022

T**L

28.11.2015

M**K

29.09.2010

D**E

20.11.2025

K**I

8.12.2008

R**W

30.09.2021

J**K

28.04.2026

H**Y

21.08.2025

M**S

7.01.2026

E**S

4.10.2025

C**.

18.04.2022

✔**S

25.06.2020

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