Greenlee 7235BB Slug-Buster Manual Knockout Kit for 1/2 to 1-1/4-Inch Conduit 4 Punch units in a high impact plastic carrying case Assortment of commonly used Slug-Buster knockout punches, packaged to meet the contractor's needs Unique punch profile also splits slugs for easier slug removal Use with battery-powered, hydraulic, ratchet or manual drivers Can be used on mild steel up to 10 gauge