This is a DW443 6" Electric Dual Action. This is a 6" Right Angle Random Orbit Sander. Electronic variable speed from 4,000 to 6.800 OPM provides greater control of material removal rate. CFS maintains controllable pad speed & minimizes gouging during start-up. Accepts 6", 6 -hole hook & loop paper. Dual plane counter balanced fan reduces user fatique. Sealed 100% ball bearing construction provides longer life. Rubber-coated gear case for low vibration operation.