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

This is a tension spring roller assembly with a V-shaped spring design is used by a variety of patio door manufacturers. The roller is a 1 in. steel ball bearing roller with 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.