Curt Manufacturing 48012 Towing Wiring Fits trailer hitches with a 2 1/2" x 2 1/2" receiver tube opening Couples to 2 5/16" couplers or lunette eyes with a 2 1/2" or 3" inside diameter Spring-loaded locking arm for secure coupling Constructed from solid, forged steel for superior strength Protected by a durable powder coat finish