The One-Piece Cast Coupler from Buyers Products features a spring-loaded latch for fast, one-hand operation, taking the chore out of coupling your trailer. The latch can be pinned opened for ease of uncoupling. The coupler features a standard 4-1/2 in. bolt pattern for bolting to a trailer nose plate (sold separately). Made of heavy duty cast steel, the coupler can handle loads of 18,000 lb. It includes a zinc-plated latch with safety pin and cable.