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Product Description The IRWIN Unibit 3-Piece TiN Step Drill Set features drill bits with single-flute cutting edges for greater control through steps. The hex shank on the drill bits helps prevent slipping in the drill chuck. IRWIN Unibit step drill bits have a nonskid, self-starting tip to minimize skidding and the need for center punching. The titanium coating withstands heat and friction to extend the cutting edge life. Amazon.com The Irwin Unibit 3-Piece Titanium Step Drill Set is an ideal choice for drilling in thin materials such as mild steel, copper, brass, aluminum, plastic, acrylic, wood, and laminates. Each bit sports a speedpoint tip for greater control, a single-fluted cutting edge for ensured roundness, and a titanium coating for less friction and added longevity. The set includes a size #1 bit for drilling holes 1/8-to-1/2-inches in diameter in 1/8-inch steps, a size #2 bit for drilling holes 13/16-to-1/2-inches in diameter in 1/16-inch steps, and a size #3 bit for drilling holes 1/4-to-3/4-inches in diameter in 1/16-inch steps. A convenient storage case is also included, and the entire set is backed by a limited lifetime warranty. What's in the Box #1 bit for drilling holes 1/8-to-1/2-inches, #2 bit for drilling 13/16-to-1/2-inches, #3 bit for drilling 1/4-to-3/4-inches, and storage case. From the Manufacturer Irwin's Unibit SpeedPoint combines the most desired features of a Step Drill, speed and control and as many as 13 different sizes onto one single-fluted step drill bit, Irwin Industrial Tools 15502 502T 3-Piece Titanium Nitrate Set (15101, 15102, 15103) Nylon Pouch