Sirr0und National Box Rail Hanger Use on wood frame metal clad doors using 2 In. x 4 In. or 2 In. x 6 In. frame. Offset 9 In. bolt adjusts both vertically and laterally from inside the door. Connecting bolts (threaded 7 In.) adjusts laterally 1 In. by turning offset bolt for desired clearance. Includes 4 washers, 4 hex nuts, and 2 end caps per pair. For use on doors up to 450 Lb. per pair. Features Delrin 500 CL bearings and WeatherGuard protection. Zinc-plated finish. National catalog Model No. 5022. MPN# N174268 SKU# 742085UPC# 38613174269