10 Pcs Diamond Burr - 1/8'' Shank Long Cone Shape Diamond Burs Bead Reamer for Dremel Rotary Tools

Don't do something dumb like put them in a drill press. Take it slow they cut a good clean hole. Make sure to back out often and i prefer to drill submerged in water to prevent binding gummy materials like surfite. I have used them for surfite and agate. A drill press will apply too much force, i used my foredom.

Love the product and the price is great - just as described!

I bought these to drill small holes in glass ornaments. I have a drill press for this purpose. The first one I tried had the tip break off. The second one never made more than a tiny divot before bending to the point of being unusable. I found another product that works much better.

Great for Beads! This is exactly what I needed to widen my beads.

2/10 bits arrived with dull, smooth, round tips. Can't use them at all.