Champion Cutting Tool Step Drill Bit: MSD-1-1/2X1/4 (Cone Cut) Professional quality step drill for drilling clean, accurate, bur free holes in sheet metals up to 1/8" thick Drill accurate holes everytime due to self starting tip which eliminates the need for pilot hole drilling Features double flute design for chatterless, fast drilling Will fit any 1/2" chuck drill Popular applications include drilling junction boxes, switch boxes, metal studs, electrical appliances, lighting fixtures, PVC, plexiglass, and auto body repair