Slide-Co 1109 Screen Door Roller Assembly, 1 in Dia Roller, 1/4 in W Roller, Polyethylene Roller, Concave Roller
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This roller assembly has an M shaped tension spring and a 1 in high density polyethylene 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.