Leviton 3777 50-Amp, 250 Volt DC/600 Volt AC, Industrial Grade, Black and White Locking Flanged Inlet, Grounding, Gray Metal Rugged Nylon Flange Fits Flush and Won't Crack in High Abuse Applications Individual Deep-Funneled Chamfered Wire Wells Guide each Wire into Rectangular Chambers Wire Clamps Provide Positive Crimp Lock Without Cutting Wire Strands 53 Amp Devices have Clamp-Type Wire Terminals and their Heavy Duty Nylon Construction Provides Excellent Impact and Chemical Resistance Black and White Plugs and Connectors are being phased in as RoHS compliant products