C.R. LAURENCE G3119 CRL 1/2″ Flat Edge Tandem Brass Window Roller Assembly with 9/16″ Wide Housing. This CRL Window Roller has a 9/16 inch (14.3millimeter) wide nylon housing. It has two 1/2 inch (12.7 millimeter) O.D. flat edge brass rollers. It is used by many window manufacturers.. Part Numbers Variations: G3119 Powered by ExportYourStore.com