Red Helix, 15 Piece, Cobalt Drill Bit Set, With Indexed Case, Sealed Clamshell, For Specialty Drilling In Hard Metals Like Stainless Steel, 35 Degree Cutting Edge Which Ends At 15 Degree Providing Faster Material Removal, Chip Breaker Reduces Heat Build Up To Stay Sharper Longer, 135 Degree Split Point Tip For Faster Starts With No Walking, Set Includes: (1) 1/16", (1) 5/64", (1) 3/32", (1) 7/64", (2) 1/8", (1) 9/64", (1) 5/32", (1) 3/16", (1) 7/32", (2)1/4", (1) 5/16", (1) 3/8" & (1) 1/2".