Package comes with five durable step drill bit. Sizes with 1/4-inch Shank: 3/16-inch - 1/2-inch, 6 steps; 1/4-inch - 3/4-inch, 9 steps. 3/8-inch Shank: 1/8-inch - 1/2-inch, 13 steps; 1/4-inch - 1-3/8-inch, 10 steps; 3/16-inch - 7/8-inch, 12 steps. 5 piece Neiko SAE Bit Step. Carry aluminum case, Two flutes- automatically deburrs as you drill, Tri-flat shank provides a sure grip, 1/4-inch Shank: 3/16-inch to 1/2-inch, 6 steps (3/16, 1/4, 5/16, 3/8, 7/16, 1/2-inch) 1/4-inch to 3/4-inch, 9 steps (1/4, 5/16, 3/8, 7/16, 1/2-inch, 9/16, 5/8, 11/16, 3/4-inch) 3/8-inch Shank: 1/8-inch to 1/2-inch, 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-inch) 1/4-inch to 1-3/8-inch, 10 steps (1/4, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1-1/8, 1-1/4, 1-3/8-inch) 3/16-inch to 7/8-inch, 12 steps (3/16, 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8-inch)