Bulk Packaged 3/32 x 3/8 inch Cone Titanium Nitride Diamond Coated Burr, 1/8 inch shank. Diamond Coated Burrs that have a Titanium Nitride coating for cooler operation and longer life, For use with Dremel Rotary Tools. Diamond coated accessories will cut into glass, wood, metal, stone, practically anything. For longer life, use with a cooling agent such as Eurotool Cut Lube.