IRWIN Step Drill Bit. 1/8-Inch to 1/2-Inch Step. 1/4-Inch Shank (10231) Low Profile Manufacturer Part Number: W5313

Manufacturer Part Number: W5313

Manufacturer Part Number: 6304C

Plugs into vehicle-side socket

Designed for professional woodworker/metal workers

IRWIN Step Drill Bit. 1/8-Inch to 1/2-Inch Step. 1/4-Inch Shank (10231) Low Profile Manufacturer Part Number: W5313Irwin 10231 Unibit #1 13 Step 1 4 Inch Step Drill Bit. 1 32 inch Steps (1 8 to 1 2 inches) 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. Ideal for drilling holes into thin materials such as stainless steel. copper. brass. aluminum.