Prime-Line 1 in. D X 0.25 in. L Nylon/Steel Spring Tension Roller Assembly 2 pk

This is a tension spring roller assembly has a V-shaped tension spring design that is used by a variety of patio door manufacturers. The roller is a 1 in. high density polyethylene roller mounted on the end of a heat treated steel tension spring that is V-shaped. The 2 in. long V-shaped flat spring inserts into the screen frame giving tension required as the door slides back and forth.