- 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
![Irwin® High Speed Steel Fractional Hole Enlarging, 13/16"-1 3/8", 10 Steps, #IR-10221 (1/Pkg) Irwin® High Speed Steel Fractional Hole Enlarging, 13/16"-1 3/8", 10 Steps, #IR-10221 (1/Pkg)](https://cdn11.bigcommerce.com/s-gdy1ehz/images/stencil/500x659/products/256264/361199/585-10221__46382.1595475278.jpg?c=2)