Professional DA (Dual Action) Sander in a comfortable palm style body. Features a 3/16" diameter orbit for general sanding (usually 120 - 400 grit sandpaper). 1/4" NPT air inlet. Comes with a vinyl back up pad to use with stick-on 6" DA Sandpaper. Can upgrade to the Velcro Back Up Pad to use with Velcro 6" DA Sandpaper.