Review on 💎 Gemstone Diamond Engraving Jewelry Cutting Tools by BQLZR by Benjamin Robinson

Diamond coating varies from drill to drill. Bought these diamond coated bits to drill holes in pieces of recycled glass and insert strands of fiber optic cable. Everyone needs to know that the drill bit (diamond coating) has to be submerged in water (for it to work at all). Bits don't work at all without a water bath to submerge the part being drilled. The hole should start at an angle. After the hole has been started, the drill can be directed. Let the drill do its job, if you use too much force you will burn off the coating on the tip of the drill and render it useless. If too much pressure is applied, the tip of the drill will generate a lot of heat. I shattered several pieces of glass by squeezing hard.