This stainless steel Arcadia style roller assembly is used by Arcadia doors as well as a variety of other patio door manufacturers. The complete assembly, wire spring and roller are stainless. It has a stainless wire tension spring and comes with a 1-1/4 in. stainless steel ball bearing roller and fits onto the Prime-Line part B 569 corner insert. It is often used on the top as well as the bottom of the sliding screen door. See the Prime-Line parts B 515, B 610, B 714, B 736 and B 821 for similar spring tension rollers.