High speed steel with titanium coating ensures extreme durability and long-lasting shine. Cobalt coating reduces friction and allows the bit to run cooler. Multiple shank sizes provide compatibility with 1/4, 3/8, and 1/2 inch chucks. Self-starting design eliminates the need for a pilot hole. Suitable for cutting holes in various materials such as steel, brass, wood, and plastic (material thickness must be less than the height of the step drill bit). Automatically deburrs holes during drilling. Mark the drilling spot for easier operation and extended bit life. Includes a protective padded aluminum case. All bits are organized for convenient transport and storage. Item Type: Step Drill Material: High Speed Steel with Cobalt Coating Color: As shown in picture 1/4 inch to 1 3/8 inch Drill Bit: 10 Steps (1/4 inch, 3/8 inch, 1/2 inch, 5/8 inch, 3/4 inch, 7/8 inch, 1 inch, 1 1/8 inch, 1 1/4 inch, 1 3/8 inch) 3/16 inch to 7/8 inch Drill Bit: 12 Steps (3/16 inch, 1/4 inch, 5/16 inch, 3/8 inch, 7/16 inch, 1/2 inch, 9/16 inch, 5/8 inch, 11/16 inch, 3/4 inch, 13/16 inch, 7/8 inch) 1/4 inch to 3/4 inch Drill Bit: 9 Steps (1/4 inch, 5/16 inch, 3/8 inch, 7/16 inch, 1/2 inch, 9/16 inch, 5/8 inch, 11/16 inch, 3/4 inch) 1/8 inch to 1/2 inch Drill Bit: 13 Steps (1/8 inch, 5/32 inch, 3/16 inch, 7/32 inch, 1/4 inch, 9/32 inch, 5/16 inch, 11/32 inch, 3/8 inch, 13/32 inch, 7/16 inch, 15/32 inch, 1/2 inch) 3/16 inch to 1/2 inch Drill Bit: 6 Steps (3/16 inch, 1/4 inch, 5/16 inch, 3/8 inch, 7/16 inch, 1/2 inch) Weight: Approx. 459g / 16.2oz Package List: 5 x Step Drill Bit, 1 x Storage Box