This replacement ball and pintle combination head offers versatile towing options and is designed to fit the CURT adjustable channel mount #45907. It features a standard 2-5/16" diameter trailer ball to fit any 2-5/16" trailer coupler. With its integrated spring-loaded arm, the ball-pintle combination can also be coupled to a 2-1/2" or 3" lunette ring (inside diameter).NOTE: Includes pintle attachment only. Channel mount sold separately.-Spring loaded clip chain is included with combo