15 Pc Cobalt Set, 1 16 in to 3 8 in Cut Diameter ORS NASCO and steel flanged mating surfaces Ideal and steel flanged mating surfaces Ideal for on the spot and emergency repairs "soft touch" acid and flux resistant grips Accommodates the full range of Weller® heaters and integral heater tips 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