Eze-Lap 5/32" diamond grinding stone with thread. For use in chainsaw grinder device or drill that uses a 1/8" shank. Shafts are precisely sized, they will not reduce or distort. Hook angle is constant, improving chainsaw operation and safety. Sharpens all cutting teeth including carbides and HSS. No sparks and will not burn or temper the cutting edge. Chains cut longer between sharpening. Outlasts life of files and stones. Only light pressure required.