Neiko 10193A Titanium Step Bits, Unibit Set, 28 Sizes, High Speed Steel, Standard (SAE) Step Drill Bit Set, Step Bits for Metal. Unibit Step Drill Bits, Industrial Unibit 3pc (1/8 - 3/4", 28S) Straight Tri-Flat Shank HSS

Our Neiko 10193A titanium coated step drill bit set replaces 28 individual drill bits. The Two-flute design makes for faster, smoother cutting, and the titanium coating helps so they run cool. Each step is gradually blended to ease stepping through hole sizes without walking. 3pc Step Drill Bits. 1/8"- 1/2", 3/16"- 1/2", 1/4"- 3/4". Package comes with one 1/8-inch to 1/2-inch thirteen-step bit, one 3/16-inch to 1/2-inch six-step bit, and one 1/4-inch to 3/4-inch nine-step bit. SET INCLUDES: Bit #1 (13 steps): 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2" Bit #2 (6 steps): 3/16", 1/4", 5/16", 3/8", 7/16", 1/2" Bit #3 (9 steps): 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4"