IRWIN Tools 1892815 Impact Performance Series 13/64-Inch 135-Degree Split Point Black Oxide Drill Bit Bulk, 12-Pack Built for maximum durability and long life with impact drivers One-piece construction withstands higher torque loads than standard quick-change bits 135Degree split point eliminates "walking" and drills with less effort Made from premium high speed steel with black oxide finish for added corrosion resistance