Model Compatibility: Fits ADS-2200, ADS-2700W, ADS-3100, ADS-3300W, ADS-4100, ADS-4300, ADS-4500W, ADS-4700W, and PRK-A3001 scanner models as listed in the title. Part Function: Serves as a pickup brake separation roller replacement for the specified scanner models. Quantity Included: Contains 5 sets of the pickup brake separation roller per package. Specification Match: Matches the pickup brake separation roller specification used in the listed scanner models. Installation Purpose: Restores pickup brake separation roller function when replacing worn or damaged units in compatible scanners.