Drill & Jewelry Bits

Gryphon's core drill bits for glass artists feature the same high quality coating as their well-respected grinder bits. Diamond bits quickly and easily remove a complete circle in glass. Core bits work with a standard electric drill and only need water as a lubricant. 25mm core bit is equal to approximately 1".  Features a 12mm shank. Shown in additional images are the packaging and examples of projects that can be created using core drill bits. Fused pendant uses 1/8" core drill bit for a perfect hole for