The Milwaukee 48-89-4445 Shockwave Impact Duty 1/4 in. Hex Drive Drill Bit Set (10-Piece) is a high-performance tool that is convenient for the heavy-duty job you're doing. Milwaukee Shockwave Impact Duty 1/4 in. Hex Drive Drill Bits are designed to be durable and last up to 10X longer. Constructed from proprietary steel and heat treated for hardness control, these drill bits offer the Milwaukee Thunderbolt web for lasting power and chip removal combined with taper-fit construction for a tougher bit with less wiggle. For faster, accurate drilling, the 135-degree split point tip begins from contact and prevents walking. The Shockwave Hex Drive Drill Bits are best for use with portable drills. Bit sizes included in this set are: (2) 1/8 in., 9/64 in., 5/32 in., 11/64 in., 3/16 in., 7/32 in., 1/4 in., 5/16 in., and 3/8 in.