ABN 3-Piece Titanium Step Drill Bit Set M2 Steel - 28 Sizes, SAE NA Imported Titanium Step Drill Bit Set 3-piece titanium step drill bits to automatically deburr holes as you drill. Replaces 28 separate drill bits. Six step bit: 3/16", 1/4", 5/16", 3/8", 7/16", 1/2"; Nine step bit: 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4"; Thirteen step bit: 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2" Two-flute design provides faster, smoother cutting. Constructed from drop forged, heat-treated steel with titanium nitride coating for durability, strength, and resistance to rust and corrosion. Secured in an aluminum carrying case to protect components and provide safe and easy transport.