Designed for use on wood-frame, metal-clad doors using a 2 x 4 in or 2 x 6 in frame with Stanley's 105270, 105676, 105213 and 105726 box rail. Includes two washers, 4 hex nuts and two end caps per pair. Made of durable one-piece, precision-formed steel. Offers self-lubricating Delrin bearings. The 1/2 in offset bolt adjusts both vertically and laterally from inside door. Connecting bolt threaded 7 in adjusted laterally 1 in by turning offset bolt for desired clearance. Can hold 450 lb per pair. 9 in bolt. Boxed.