This 6" finishing sander with 8 mm orbit is constructed of precision molded composites for strength and durability, while reducing operator fatigue. Its construction also reduces sound for increased comfort. True 12,000 rpm performance - for maximum productivity. Counter-balanced for specific size backup pad. Features moisture-resistant composite rotors, and premium counterweight bearings for long life and superior reliability. MR-Series Sanders can be converted to vacuum operation with the addition of an external or self-generating vacuum adapter.