A Curt Manufacturing gooseneck hitch is more than a necessary tool for towing; it is an integrated extension of your truck that allows you turn your 4x4 into the workhorse it was designed to be. The Curt Manufacturing under-bed Double Lock gooseneck hitch is strong, fast and easy to operate. It gets its name from the two locking pins that engage the trailer ball and hold it in place, giving you twice the security when towing especially heavy trailers.This replacement gooseneck ball is designed to fit the Curt Manufacturing Double Lock gooseneck hitch #60607. It features a tough chrome-plated finish to stand up to the strain of heavy-duty towing and is tested to meet U.S. V-5 specifications. It also features a 2 5/16" ball diameter to fit most gooseneck trailers.