Irwin UniBit No. 4 HSS Metric Step Drill Bit 1M/2M/3M/4M/5M (3/16" - 7/8") - 10234 Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates Single-flute cutting edge for greater control through steps 3 flatted shank prevents slipping in drill chuck Also available with titanium nitride coating for longer life New SpeedPoint tip penetrates faster than previous Unibits and prevents walking Color: High Speed Steel Weight(KG): 0.100