This Arcadia style roller assembly is used by Arcadia doors as well as many other patio door manufacturers. This is also currently a very popular design amongst patio door manufacturers in today s market place. It has a wire tension spring and comes with a 1 in steel ball bearing roller and fits onto the B 569 corner insert. It is often used on the top as well as the bottom of the sliding screen door. Steel ball bearing roller will roll smoothly Steel ball bearing roller will roll smoothly It has a wire tension spring