This sliding screen door roller assembly insert has an high density polyethylene frame with an adjustable high density polyethylene inner housing and high density polyethylene ball bearing roller. The assembly inserts into the bottom or top of the sliding screen door using the included screws. The roller adjusts to the correct position needed. This style is found on Columbia sliding screen doors but is also used on a variety of other sliding screen door manufacturers. Note dimensions and design when comparing with the roller assembly to be replaced.Find the ROLLER SCREEN DOOR 1 at Ace.