HTS 111C3-4 4 Pack 7/32" Diamond Chainsaw Sharpening Rotary Bit Set with 1/8" Shank 1-3/4" overall length; 7/32" burr diameter; 1/8" diameter shank 120 - 150 grit industrial diamond coating Designed for use in rotary tools that accept a 1/8" shank Set includes 4 bits