Irwin Unibit Self-Starting Step Drill #3

Drills 1/4 to 3/4 holes in 1/16 increments. Has 9 steps on bit. Single flute cutting edge for greater control through steps. Three flatted shank 3/8 prevents slipping in drill chuck. Speedpoint tip penetrates faster and prevents walking. Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates.