Hubbell Wiring Device-Kellems Twist-Lock flanged inlets and receptacles provide a secure electrical connection. The inlets contain curved blades which are matched & inserted in the curved receptacle. They ensure a consistent flow of electricity in industrial machinery & electronic equipment, and are securely locked into place with a twisting motion to prevent accidental disconnection. Flanged inlets & receptacles are NEMA rated and have a dust shield to protect against accumulation of foreign material. The standard, back wired and pressure screw terminals securely mount wires into these plugs & receptacles. Choose from a wide range of flanged connectors, available in nylon, brass, steel, stainless steel, metallic & centrex housing variants.