Irwin Unibit Self-Starting Step Drill #1

Drills 1/8 to 1/2 holes in 1/32 increments. Has 13 steps on bit. Single flute cutting edge for greater control through steps.Three flatted shank 1/4″ 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.