Designed for use with box rail on wood-frame sliding doors from 1-1/2 to 2 in Thick. For use with #59 or #5110 box rail. Packed with nine 3/8 x 2 in lag screws for mounting rail and two end caps. Hangers have vertical and lateral adjustments that can be made from outside building. Durable one-piece, precision formed steel. Comes with self-lubricating Delrin bearings. 1/2 in offset bolt is threaded 5-1/2 in with a lateral adjustment of 1 in by turning bolt. Safe working load – 225 lb. per hanger.