C.R. LAURENCE M6054 CRL Chrome 3/4" Nylon Ball Bearing Shower Door Flat Edge Roller Assembly. This CRL Frameless Sliding Shower Door Roller Assembly uses a 1/4 inch (6 millimeter) thru-glass binder post. The aluminum bracket is 1-7/8 inches (47.6 millimeter) wide and has a screw slot which allows for adjustment of the 3/4 inch (19.1 millimeter) flat edge nylon wheel.. Part Numbers Variations: M6054