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IRWIN Impact Performance Series Drill Bits are built for maximum durability and long life with impact drivers. These bits feature a one-piece construction that withstands higher torque loads than standard quick change bits that are built with a two-piece design. They have a 135-degree split point that eliminates "walking" and drills with less effort. These bits are made from premium high speed steel with a black oxide finish for added corrosion resistance. Plus, they have a 1/4" quick-change shank that's designed to work in all impact drivers, and reduces slipping when used in standard drill chucks.