Prime-Line B 640 Roller Assembly, 1 in Dia Roller, 1/4 in W Roller, Polyethylene Roller, Concave Roller, 5/16 in W

This roller assembly with M shaped tension spring with a 1 in high density polyethylene ball bearing roller is used by several patio door manufacturers. The heat-treated tension spring is 2-5/16 in L and shaped like an M giving it the tension needed by the screen door to slide properly.

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