Features and Benefits:A more aggressive version of the Model 4500 for those who want to do a superior job fasterA newly designed Air-Efficient motor with Positive-Action Drive backed by 4-support bearings powers a unique oversize drive head for full contact sanding. Best for detailing feathering and leveling Does great finishing too! New positive air-control valve 6″ Pad Standard 5″ & 8″ Pads Available.