Greenlee 36692 Manual Slug-Buster Knockout Punch Kit, Metric, ISO-16 Through ISO-40 1-Inch (25.4 mm) hex ratchet wrench allows use with both 3/8-Inch (9.5 mm) and 3/4-Inch (19.1 mm) draw studs 3/8-Inch (9.7 mm) Kwik Stepper step bit included Includes ISO size punches 16, 25, 32,and 40 High-impact, rugged plastic carrying case Can be used on mild steel up to 10 gauge