Steel Vision Super Premium 29 pc Stepped Tip Drill Bit Set, Heavy Duty Drill Bit, TurboStep, 29pc HSS Reduced Shank Mechanics Length 1/16" - 1/2" Drill Bit SetBrand: Steel Vision Features: 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,