Irwin/Hanson UN4 No. 4 High Speed Steel Frac Self Starting Unibit Drill Bit

Single flute cutting edge for greater control through steps. Hex shank prevents slipping in drill chuck.

New SpeedPoint tip penetrates faster than previous Unibits and prevents walking. Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastics and laminates. Hole sizes: 3/16" - 7/8"; number of holes: 12 steps.