This versatile buffing system is equally at home in a cabinet shop or on a knife maker Inch or gunsmith-inch bench and is available in either 3450 rpm or 1725 rpm. motor is heavy-duty tic 1 hip 110v. large 1-Inch diameter shafts extend 8-Inch on either side and have a 5/8-Inch threaded arbor on the ends. weights 59 lbs.