This is a set of two top mounted mirrored door roller assemblies that are spring-loaded. They have a 7/8 inch convex or round edged nylon roller that hang in a track mounted above. They also work as corner brackets holding the sides and the top rail together. Used by Acme and a variety of other mirrored door manufacturers.
simple adjustment necessary to make it work for my application. Neal. Mississauga, ON. Tue Apr 14 2020