The MR-6, Mirka 6 in.Sander with 3/16" (5mm) orbit is designed for general purpose sanding. This tool is a lightweight sander constructed of precision molded composites for strength and durability, while reducing operator fatigue. Composite construction also reduces sound for increased comfort. It provides true 12,000 rpm performance - for maximum productivity. The MR-6 sander is counter-balanced for its specific size backup pad. This high-quality tool features moisture-resistant composite rotors, machined and balanced counterweights and premium counterweight bearings for long life and superior reliability. Can be converted to vacuum operation with model-specific kits. Comes with a PSA backup pad, pad wrench, and a bottle of air-tool oil.