Andersen Original Lower Screen Door Roller Assembly.Andersen Patio Door bottom screen roller assembly. (pre - 1991)Screws not included, available on request.This nylon screen roller assembly replaces screen rollers that have adjustment holes on the face of the bottom screen rail.This is a Genuine Andersen screen roller.NOTE: For After market / Generic Knockoff see # 11033 at less than 1/2 the price.Made in China They look exactly like Andersen, Works just like the AndersenTwo ways to Identify Andersen Genuine Part from Knockoff / Generic ones1. Andersen has Patent number info and part number 7131-2 marked on top Generic is Plain - No Markings on top - smooth Plastic2. Andersen has rivet holding in wheel and a hole above; Generic has Rivet in both holes3. See Additional PicturesContents: 2 roller assembliesPriced and sold as a pair.Related Parts11033 Bottom Roller - Nylon Wheel11087 Top Roller - Steel Wheel11071 Top Roller - Nylon Wheel