Leviton 5378 50 Amp, 250 Volt, Surface Mounting Receptacle, Straight Blade, Industrial Grade, Grounding, Black Heavy-Gauge, Double-Wipe Copper Alloy Contacts Easy-To-Wire Terminals Accept up to No. 4 AWG Conductors Terminals Marked for Easy Identification and Fast Wiring All Mounting Hardware Included Surface-Mount Devices are COMERCIAL GRADE and have Concentric Knockouts for 3/4-Inch and 1-Inch Conduit And Adjustable Cord Clamp for Back and Bottom Entrance of Cable