Irwin Unibit 10220 Step Drill Bit, 9/16 to 1 in Dia, 1-Flute, 7/16 in Dia Shank, Hex Shank

Hole enlarging features bit single flute cutting edge for greater control through steps and a true round hole, 3 flatted shank prevents slipping in drill chuck. Used in applications such as drilling holes into thin stainless steel, copper, brass, aluminum, plastic and laminates, pilot hole required.

• Single-flute cutting edge for greater control through steps
• Single-flute cutting edge for greater control through steps
• Three flatted shank prevents slipping in drill chuck
• Patented single-flute cutting edge gives the user a true round hole every time