STRAIGHTLINE ACTION. Same mechanical advantages as 2000-MOM , without Multi-Options. Newly designed Motor specifically structured for mini-strightline strokes provides unexcelled power without battering the surface. 2-Cylinder, twin-drive, with vertically-engaged gears, ensures pure reciprocal strokes so smooth that coarse sanding, ultra-fine sanding, or blemish removal are a matter of adjusting the speed and choosing the right grit. Choice of 3 Pad sizes. Pads are interchangeable.