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Irwin 15506SM Vise-Grip 3-Piece High-Speed Steel and Cobalt Unicity Bit Set Save time by eliminating the need to change drills when drilling round holes in thin materials. Each smaller size drill also acts as a pilot for the next size. Patented single-flute cutting edge gives greater control through steps and a true round hole every time. Durable titanium coating limits friction and provides longevity. Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates. Set contains #1 and #4 High Speed Steel Unbaits and an M35 grade Cobalt #2 Unicity. Laser-marked sizes on all bits. Speed Point tip penetrates faster than previous Unbaits and prevents walking. 3-faltted hex shank prevents slipping in drill chuck.