Bulk Packaged 10pc 1/8 x 1 7/8 inch Diamond Bead Reamer, 1/8 inch shank. Overall length is about 2 3/4 inches. Approximately 0.021 of an inch at the very tip. 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.