The Marathon 410-GP-1921-01PSB is a 125/250-volt, single-phase, 20-Amp, twist-lock plug. It features a grounding pin, non-grounding blend pins, a standard 4-prong configuration, and a NEMA 4-20P designation. It is rated for use with either copper or aluminum wiring and is UL listed for indoor and outdoor use. This plug is designed to safely power portable tools, electrical equipment, or other temporary devices that require a plug-in connection.