Aluminum head provides strength with minimum weight, reducing operator fatigue | Contoured handle design gives better operator leverage and makes it possible to punch in tight places | Self-stripping design eliminates punch hang-ups | Automatically centers holes on standard studs | Conversion kit available to upgrade early models from 24 gauge to 20 gauge maximum capacityAmazon.ca Product DescriptionGreenlee's metal stud punch can handle 2-1/2-Inch and wider studs. And can punch through 20 gauge steel studs in one stroke.From the ManufacturerGreenlee's metal stud punch can handle 2-1/2" and wider studs. And can punch through 20 gauge steel studs in one stroke.