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This roller assembly with M-shaped tension spring with a 1 in. nylon ball bearing roller is used by a variety of patio door manufacturers. The heat treated tension spring is 2-5/16 in. long and shaped like an M, giving it the tension needed by the screen door to slide properly.Used by a variety of sliding screen patio door manufacturers,2-5/16 in. M-shaped tension spring,1 in. concave ball bearing roller,Steel heat treated tension spring and nylon roller,2-pack,Easy to install,No adjustment needed,For further dimensional information, please see the line drawing
