Designed for use with box rail on woodframe 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 38 x 212 in lag bolts also are included for mounting rail Durable one piece, precision formed steel Comes with selflubricating Delrin bearings 12 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