Constructed of M-42 8% cobalt high-speed steel for super abrasive resistance in tough metals. Bits have a 135 deg split point which reduces feed pressure for easier penetration. Includes (2) 1/16 in, (2) 5/64 in, 3/32 in, (2) 7/64 in, 1/8 in, (2) 9/64 in, 5/32 in, 3/16 in, 7/32 in, 1/4 in, 5/16 in, 3/8 in and (1) rubber-sided case with sliding latch for added security.