Bulk Packaged 10pc 1/16 x 1 3/16 inch Diamond Bead Reamer, 1/8 inch shank. Approximately 0.018 inch at the very tip. 2 3/4 inch overall in length. For use with Dremel Type 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.