Typically used by EZ-Glide pocket doors and can be used with other pocket door systems that have 1-3/8 inch thick doors Features convex (round) edge tire that has a 1-1/4 inch diameter and is 5/16 inch thick Constructed of nylon tire, steel ball bearings and a diecast bracket with rubber shoes with mounting hoes 2-1/4 inch on center All the necessary fasteners are included in the factory sealed package for a complete installation Please refer to the line art drawing and compare with your original item before purchasing (Not Universal)