Mirka's finishing sanders are constructed of precision molded composites for strength and durability, while reducing operator fatigue. This construction also reduces sound for increased comfort. Random-orbital disc finishing sanders provide 12,000 rpm performance - for maximum productivity. Each model is counter-balanced for its specific size backup pad. Features moisture-resistant composite rotors, and premium counterweight bearings for long life and superior reliability. Finishing Sanders can be converted to self-generated or central vacuum operation with the addition of a vacuum conversion kit. Sanders come with a backup pad, pad wrench, and a bottle of air-tool oil.