Designed for use with box rail on wood-frame or metal clad doors using a 2 x 4 in or 2 x 6 in frame. For use with #59 or #5110 box rail. Packed with two washers, 4 hex nuts and two end caps per pair, seventeen 3/8 x 2-1/2 in lag bolts also are included for mounting rail. Durable one piece, precision formed steel. Comes with self-lubricating Delrin bearings. 1/2 in offset bolt adjusts both vertically and laterally from inside door. Connecting bolt threaded 6 in adjusts laterally 1 in by turning offset bolt for desired clearance. Safe working load - 225 lb per hanger. 9 in bolt.