B 521 - Screen door 2-1/2 inch Flat Tension Spring, 1 inch high density polyethlene roller, 2 per pkg.
This center grooved sliding screen door tension roller is used by many patio door manufacturers. Used on the bottom as well as the top of the sliding screen door. The roller is a grooved high density polyethlene roller. The tension spring is 2-1/2 inches long & is a heat treated high tension steel spring. For Stainless Steel see B 573
- 1 inch high density polyethlene roller
- 1/4 inch roller width
- Concave (Grooved) roller
- High density polyethylene roller will not rust
- Heat treated tension spring
- 2-1/2 inch straight tension spring