National Hardware Box Rail HangersDesigned for use on box rail with wood frame sliding doors from 1 1 2" to 2" thick For use with #59, #5100, #5103, #5104, #5105, #5110, #5114 or #5116 box rail Packed with 2 end caps and bolts for attaching door strap Adjustable both laterally and vertically Comes with self lubricating Delrin bearings Made of durable one piece, precision formed steel Safe Working Load 225 lb. per hanger