Designed for use on wood-frame, metal-clad doors using a 2"x4" or 2"x6" frame with Stanley's 105270, 105676, 105213, and 105726 box rail. Includes two washers, four hex nuts, and two end caps per pair. Made of durable one-piece, precision-formed steel. Offers self-lubricating Delrin bearings. The 1/2" offset bolt adjusts both vertically and laterally from inside door. Connecting bolt threaded 7" adjusted laterally 1" by turning offset bolt for desired clearance. Can hold 450 lbs. per pair. 9" bolt. Boxed.