The Bosch OS50VC features a Powerful 3.4 Amp motor and Variable-Speed Dial to match speed to task (8,000-11,000 OPMs). Vibration Control Bosch-exclusive suspension system minimizes vibration for superior handling and maximum comfort. Sheet Loc Supreme Sandpaper Attachment System - Pulls regular sandpaper flat and tight. Also accepts stick-on paper. Multiple ergonomic soft-grip locations help prevent hand fatigue. Rugged die-cast aluminum gear housing Long-life design eliminates wobble and vibration. High-performance Soft Microcellular Backing Pad conforms too many contours.