The Milwaukee Shockwave 2" Impact Phillips #2 Power Bits 15-Piece Contractor Pack (48-32-5004) are engineered to be the most durable, best fitting driver bits on the market. The optimized Shockzone geometry is unique for each tip type to provide up to 30x longer life and absorbs 3x more torque vs. other impact bits. The precise fit custom machined tip prevents stripping and reduces wobble while the Custom Alloy76 steel and proprietary heat treat process maximizes resistance to wear and shock. Shockwave driver bits are built to deliver extreme durability for the most demanding applications.