Random Orbit Action. A more aggressive version of the Model 8650 with multiple benefits in heavy duty and preparatory sanding. Great for detailing and feathering. Produces superior finishes second only to the Model 8650. Specially designed motor produces more muscle. 4-bearing shaft support teamed with oversized 2 5/8" drive head enforces full-contact sanding for productivity and economy. Multi-Options include full vacuum mode. or dust-free sanding using detachable dust bag for shops without vac-systems.