The Milwaukee M12BPS Polisher/Sander has a variable two speed selection for both polishing and sanding applications. It has a compact design, only 130mm, which allows access to hard to reach areas and a spindle lock allows for fast, tool free accessory change. It has a large capacity of up to 76mm polishing sponge and 50mm sanding pad size, for fast job completion and comes with a detachable 2 position side handle. It is capable of a long run time allowing frequent task completion with one battery charge. It is fitted with REDLINK™ overload protection electronics in the tool and battery pack that delivers best in class system durability and individual battery cell monitoring optimises tool run time and ensures long term pack durability. M12BPS-412X: 1 x 12 Volt 4.0Ah and 1 x 12 Volt 2.0Ah Li-Ion Battery.M12BPS-0: Bare Unit, No Battery or Charger Supplied. Specifications: No Load Speed: 0-2,800/0-8,300/min.Spindle Size: M9 x 0.75.Disc Diameter: 76mm. Sound Power Level: 79.2 dB(A).Sound Power Level Uncertainty: 3 dB(A).Sound Pressure Level: 68.24 dB(A).Sound Pressure Level Uncertainty: 3 dB(A). Vibration Polishing: 2.95 m/s².Vibration Polishing Uncertainty: 1.83 m/s². Vibration Sanding: 2.3 m/s².Vibration Sanding Uncertainty: 1.5 m/s². M12BPS-0 Cordless Polisher/Sander 12 Volt. Bare Unit, No Battery or Charger Supplied.