FOR TRAVEL TRAILERS & 5th WHEEL TRAILERS. This SOCKET JENIE socket requires a 3/8” drill chuck, and can be used with a 110V or battery operated drill. This socket was designed for use with the old style “BAL” type scissor jacks on travel trailers and the rear jacks of 5th wheel units. This model is still used for some models of the Trailmanor expandable travel trailer. The bent end is inserted into a hole in the end of the tube in which it is attached to the screw thread of the jack. See LVSG-750 for the newer style that uses a ¾” drive nut that replaces the tube. Known brands that use the ¾” hex drive: Fleetwood, Keystone, Trailmanor, Jayco, Coachmen, Forest River, and National.