Neiko 10189A Titanium Step Drill Bit, High Speed Steel | 7/16" to 1-1/8" | Total 12 Step Sizes. TITANIUM BIT: Includes a two-flute design for faster, smoother cutting CUTS AND DEBURRS: Cuts through steel, sheet metal and other surfaces with only a small amount of pressure and deburrs as you drill SUPER STRONG: This all-in-one step drill bit is made of super strong HSS steel and is titanium nitride coated for added durability MULTIPLE DRILL SIZES WITH ONE BIT: 7/16", 1/2", 9/16, 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1", 1-1/16", 1-1/8" VERSATILE AND FAST: With this handy bit, you can drill new holes and enlarge existing holes without having to change bits