Built durable, the National MFG Box Rail Hanger Flexible with 1/2" Offset Bolt includes two washers, four hex nuts and two end caps per pair. Designed for use on wood-frame, metal clad doors using a 2" x 4" or 2" x 6" frame. Use this hanger with National's #59, #5100, #5103, #5104, #5105, #5110, #5114 or #5116 box rail. This hanger features a one-piece, precision-forMedium steel body and self lubricated Derlin bearings. The 1/2" offset bolt will adjust both vertically and laterally from inside the door. Try connecting the bolt thread 7" x 1", by turning the offset bolt for your desired clearance.