Box Rail Hanger For Sliding Barn Door, Zinc, 9-In. Bolt, 2-Pack2 Pack Zinc box rail hanger with 9" bolt, designed for use on wood frame, metal clad doors using a 2" x 4" or 2" x 6" frame with national's #59, #5100, #5103, #5104, #5105, #5110, #5114 or #5116 box rail, includes 2 washers, four hex nuts, & 2 end caps per pair, made of durable 1 piece, precision formed steel, the 1 2" offset bolt adjusts both vertically & laterally from inside door, connecting bolt threaded 7" adjusted laterally 1" by turning offset