The Cooper Wiring Devices L620C 20-Amp 250-Volt Hart-Lock Industrial Grade Connector with Safety Grip is designed and built with superior materials for long-lasting performance. It is used for 20-amp 250-volt with a NEMA L6-20C applications. NEMA provides a forum for the standardization and testing of electrical equipment, enabling consumers to select from a range of safe, effective, and compatible electronics. Its ribbed nylon construction is rugged and durable for dependable use. It features multiple-head screws for flexibility in the installation and ease of use. This devices features a smooth, tapered body that reduces snagging and provides easy handling. It has neoprene gasket seals around the cord for added terminal protection from external elements. The cord grip inserts accommodate a wide range of cord diameter. It features serrated terminal plates and contoured terminal clamp "bites" on the conductors for positive termination. A Single piece grounding contacts provides superior continuity. Cooper Wiring Devices is committed to providing products that increase productivity, energy efficiency, safety at work and in the home, and produce reliable performance. Whether a home-Feets style is traditional, modern, casual, cozy or rustic, it will demand more from wiring devices than in years past. Cooper Wiring Devices is dedicated to providing the up-to-date wiring device solutions that today-Feets homes need.