Compatible Door Systems: Typically used by EZ-Glide pocket doors and can be used with other pocket door systems that have 1-3/8-inch-thick doors Convex Tire Design: Features convex (round) edge tire that has a 1-1/4-inch diameter and is 5/16-inch-thick with a fixed height that is not adjustable on a 2-1/2-inch x 1-3/8-inch base Durable Construction: Constructed of nylon tire, steel ball bearings, and a diecast bracket with rubber shoes with mounting holes 2-1/4-inch on center Complete Installation Package: All the necessary fasteners are included in the factory sealed package for a complete installation Important Sizing Information: Please refer to the line art drawing for dimensions and compare with your needs item before purchasing (Not Universal) Smooth and Quiet Operation: Steel ball bearings provide smooth, long-lasting, and quiet rolling performance for your pocket door system Top Mount Design: Roller assembly mounts on the tops of sliding pocket doors and is adjustable once installed for proper door alignment