Shockwave Impact Duty 1/4" hex drive drill bits are engineered for extreme durability and up to 10 times life. Made from proprietary steel and heat treated to control hardness, these bits feature the Thunderbolt web for durability and chipremoval paired with taper-fit construction for a stronger bit with less wobble. The bits include a 135 degree split point to allow the bit to start on contact and eliminates walking. Broadly targeting cordless users, the Shockwave Impact Duty accessory line is not only ideal for heavy-duty impact applications, but delivers a full system solution for all theuser's drilling and fastening needs. Set includes 1 each: 1/8", 5/32", 3/16", 1/4" hex drive drill bits.