Prime-Line B 522 Center Grooved Roller Assembly, 1 in Dia Roller, 1/4 in W Roller, Steel Roller, Concave Roller, Steel

This center grooved sliding screen door tension roller is used by many patio door manufacturers. Used on the bottom as well as the top of the sliding screen door. The roller is a 1 in steel ball bearing roller. The tension spring 2-1/2 in L and is a heat-treated high tension steel spring.