Gardner Bender KOM50125 Slug-Out Mechanical Knockout Set, Contractor Punch, Die, Bearing & Drive Screw Set, &frac12;- 1&frac14; Inch Conduit Pipe Size Cutting Diameter, 10 AWG Mild Steel & 12 AWG Stainless Steel Set includes the four most popular sizes of punches and dies packed in a sturdy storage case. Punches up to 10 AWG mild-steel and 12 AWG stainless steel Punches, dies, and draw studs are constructed from black oxide coated, hardened and tempered chrome-moly steel Durable storage case Interchangeable with competitors' parts