15 Pc Cobalt Set, 1 16 in to 3 8 in Cut Diameter ORS NASCO U shaped jaws provide enhanced visibility U shaped jaws provide enhanced visibility and more working space Holds work in proper alignment Turn screw to adjust pressure and fit Constructed of high grade heat treated alloy steel Guarded release trigger quickly unlocks and protects from accidental release 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 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