This product is designed for use with box rail systems featuring wood-frame sliding doors that are 1-1/2″ to 2″ thick. It is compatible with box rails #59, #5100, #5103, #5104, #5105, #5110, #5114, or #5116. The package includes two end caps and bolts for attaching the door strap. The hanger is adjustable both laterally and vertically and is equipped with self-lubricating Delrin bearings. It is constructed from durable, one-piece, precision-formed steel and has a safe working load of 225 lbs per hanger.