Made from machine forged chrome steel, the Trimax T3Black Receiver Lock offers a 5/8" pin with a rugged black epoxy powder coat. The 5/8" pin fits all Class III and IV receiver hitches and prevents false locking--lock can't just pop open. Durable and resilient, a quarter turn of the rugged tube key locks and unlocks the strongest locking pin. Plus, it boasts a water tight cap that seals out dirt and corrosion. Fits a span of 2 3/4".