Astro Tools TS21 Onyx 21pc TurboStep HSS Mechanics Length 1/16" 3/8" Drill Bit Set

Spiral fluted PATENTED stepped-tip drill bits that simply outperform every conventional drill bit design in nearly all materials. Patented design eliminates bit walk and the need for pilot holes. Excels on hard alloys, sheet metal, and imperfect parts that are difficult to start drilling into Precision ground from heat treated quality M2 High Speed Steel and Onyx oxide coated to prevent chip build-up Three-flat shanks and mechanic’s length for superior access in cramped spaces