15 Pc Cobalt Set, 1 16 in to 3 8 in Cut Diameter ORS NASCO Unique blend designed to clean Unique blend designed to clean the hands without harsh acids or alkalis Works equally well with or without the use of water Leaves hands looking and feeling clean Half round block Will sweep finest dust or grit Use for sweeping smooth highly polished floors Constructed of M 42 8 percent cobalt high speed steel for super abrasive resistance in tough metals 135 degree split point reduces feed pressure for easier penetration without work hardening Durable rubber sided case for added impact resistance Sliding latch design provides added security Available with a variety of drill bit types and piece count configurations