Marinca Power Products 50 Amp Locking Devices are designed for fast and easy assembly, while providing high-quality features that enhance versatility, safety, and durability. Rear housing key fits into the front portion for ease of assembly. A stainless plug sleeve provides greater strength and protection. A non-metallic shell around the plug sleeve eliminates exposed metal parts. Other features include an adjustable cord clamp for superior strain relief, recessed cord clamp screws for a neat, clean appearance, exclusive perma Perma-Lock™ terminals for secure, easy-to-wire connections, thick-walled nylon housing that resists abuse, corrosion, and most chemicals, and a neoprene dust seal to keep contaminants out of the wiring chamber.