Irwin 10313 Unibit13 1-1/8-Inch 1/2-Inch Shank Step Drill Bit

Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates | Single-flute cutting edge for greater control through steps | Patented single-flute cutting edge gives the user a true round hole every time | 3 faltted shank prevents slipping in drill chuck | New speedpoint tip penetrates faster than previous unibits and prevents walkingAmazon.ca Product DescriptionThis IRWIN Unibit #13 High-Speed Steel Fractional Self-Starting Step Drill Bit features a single-flute cutting edge for greater control through each of its 2 steps. The hex shank helps prevent slipping in a drill chuck. Use this reliable drill bit to drill holes into thin materials like stainless-steel, copper and more.From the ManufacturerUNIBIT 13 1-1/8" - Single Hole Size