Self-Starting Step Drill Bit, 7/8 IN Dia Min Hole, 1-1/8 IN Dia Max

Irwin® Unibit® step drill bits are ideal for drilling holes in just about any type of thin material. These high speed steel step drill bits are perfect for use in mild steel, copper, brass, aluminum, plexiglass, wood, and laminate. Our titanium nitride coated bits resist heat and friction, extending the life of the cutting edge six times longer than standard step drills. Manufactured with a single flute cutting edge that drills multiple sizes of true, round holes with precise step control.