Irwin Unibit Size 1, 13 Hole (1/8 - 1/2) Self-Starting Step Drill Bit with 1/32 increments features single flute cutting edge for greater control through steps and new speed point tip that penetrates faster than previous unibits and prevents walking. 13 Steps drill bit with hex shanks prevents slipping in drill chuck and has 1/8 maximum material thickness that is ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates. Applications Stainless steel Copper Brass Aluminum Plastic Laminates Weight(KG): 0.100