Dormer A00211.1 HSS Tin Tipped, Split Point, Jobber Dril Bit 21 Piece Jobber Length Drill Bit Set, High Speed Steel (HSS), 135 Degree Split Point Stark USA 21PC Industrial Drill Bit Set Black Gold Finish, 1 16" 1 2 Cobalt Drill Bit Set 15 64 in.HSS M35 Jobber Length Twist Metalworking Choosing The Right Drill Bit For Hardened Steel: A Comprehensive Guide. Set includes 1 16" through 3 8" by 64ths High Speed Steel (HSS) jobber length drill bits with metal index. HSS drill bits are surface treated and feature a 135 type P3 split point. Provides excellent results in hard steels, titanium and other hard materials. Features: SPECIFICATIONS Drill Bit Sizes: 1 16 in 3 8 in by 64ths Length: Jobber Material: High Speed Steel (HSS) Surface treated for abrasion resistance and improved chip flow No center punch needed 135 split point begins cutting action immediately, penetrates faster with less pressure and prevents walking Tool Type: For power and portable drilling