Rigid box hanger for use on wood frame sliding doors from 1-1/2 In. to 2 In. thick. Laterally and vertically adjustable. Hangers are packed with 2 end caps and bolts for attaching door strap. Door strap is 5-1/4 In. long. For use on doors up to 450 pounds. Delrin 500CL bearings. Zinc-plated and comes boxed per pair. National catalog model No. 5005.