Diamond Drill Bit 1.5mm 2mm Set 10 Pcs Jewelry Beach Sea Glass Shells Gemstones 10 Pieces 1.5 and 2 mm 5 ea. Twist Bits Kit Pack by Drilax

I tried everything to see why they wouldn't drill through what the product advertised. Still didn't work and actually, the tip would just keep breaking.

Works great. Speeds and feeds are important as well as coolant. This will determine life of tool.

I purchased them to drill river rock which is very hard. These did not do the job.

The drill bits work excellent. Just make sure you hold the pieces secure and use cooling fluid or water

These work great on glass beads. I dipped in water and did not press too hard as instructed.

I searched for weeks for the correct bits for making sea glass jewelry and these were the winners!! They're exactly what I needed! Tysm ;)