SOCKET JENIE LVSG-750 FOR TRAVEL TRAILERS, TRUCK CAMPERS (ATWOOD style), & 5TH WHEEL TRAILERS This socket requires a 3/8” drill chuck, and can be used with a 110V or battery operated drill. In 1997 the industry started converting to this design that used a crank that had a ¾” socket formed into the end. Since that time most of the towable vehicles have made the transition to this version of crank. If your vehicle uses the bent or hook type crank, see LVSG-437 old style jack. Known brands using this socket: Fleetwood, Keystone, Jayco, Coachmen, Forest River, Palimino truck campers, and National. The new LIGHT DUTY TRAILER LEVELER by BAL has just introduced a device to level fold down trailers, and utilizes a ¾” hex crank that can be replaced with this socket.