Are you having trouble sliding your screen door open or closed? Have you checked your rollers/roller assemblies? Don't replace the entire door. For a fraction of the cost of a new door, replace those worn-out rollers. This sliding screen door roller assembly is used on Monar Doors and is primarily found to be used in Canada. It has a diecast housing with a 1-1/8 Inch high density polyethylene roller and a unique looped flat tension spring on top. It fits onto the diecast corner housing of Prime-Line part B 712 (purchased separately). Order yours today and have your door slide like new.