C.R. LAURENCE G3146 CRL Sliding Window Roller with 7/16″ Nylon Wheel for Milgard Windows. This CRL Window Roller Assembly is 1/2 inch (12.7 millimeter) wide and has tandem 7/16 inch (11.1 millimeter) diameter nylon wheels. The assembly is used on Milgard and other sliding windows.. Part Numbers Variations: G3146 Powered by ExportYourStore.com