Irwin 10221 Unibit 21 13/16-Inch to 1-3/8-Inch 1/2-Inch Shank Hole Enlarging Step Drill Bit
- Unibit: High Speed Steel Fractional Hole Enlarging
- Description: #21
- Hole Sizes: 13/16" - 1-3/8"
- No. of Holes: 10 steps
- Maximum Material Thickness: 1/8"
- Single-flute cutting edge for greater control through steps
- 3 flatted shank prevents slipping in drill chuck
- Also available with titanium nitride coating for longer life
- Patented single-flute cutting edge gives the user a true round hole every time
- Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates
- Pilot hole required
- SKU: 579248
- Mfg Part Number: 10221
- Weight: 0.50 LB