This Dico / Titan Model 60 surge brake actuator is equipped with a lever-lock coupler to fit 2" hitch balls. Coupler can be adjusted to fit 1-7/8", or 50mm hitch balls by tightening the coupler's locknut. Unit is designed to work with disc brakes, bolts to a 3" wide trailer tongue and includes electric reverse lock-out solenoid to prevent application of brakes when backing up. (Trailer must be wired properly to use this feature.) Rated for up to 7,000 lbs. with a maximum tongue weight of 700 lbs. Includes breakaway device. Zinc plate finish. Titan part number: 47154207K Please note: Mounting hardware or wiring for the reverse lock-out is not included.