Bulk Packaged 1 x 4 mm, 3/64 x 5/32 inch Flat End Cone Medium Grit Diamond Coated Burr, 3/32 inch shank. 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. Made in Germany