This item replaces screen rollers that have adjustment holes on the edge of the screen frame. Nylon housing with a nylon concave wheel that measures 1-1/4" in diameter and 5/16" thick. Works with these patio door gliding screens manufactured from 1991 to Present. Works with top screen rollers 1997063. Note: No fasteners are needed for this wheel assembly. (Clips into bottom screen rail from the bottom.) We recommend replacing both rollers at the same time.