The Raytech AV-18 Heavy Duty Vibrating Rock Tumbler has been newly redesigned as a much heavier machine, positioned to be the most durable tumbler of its class. The vibrating bowl holds about .18 cubic feet, or about 16 pounds. Built-in inlet and outlet ports simplify rinsing, and the heavy-duty motor has an adjustable amplitude so you use only the power you need. Raytech tumblers are backed by a one-year warranty. About Raytech Industries Raytech Industries, a division of Lyman Products Corporation, specializes in the manufacture and sale of high quality gem cutting, polishing, finishing equipment and accessories for everyone; from the hobbyistto the industrial user. * Vibrating rock polisher * Redesigned for durability * Holds .18 cubic ft, 16 lbs. * Cyclonic effect moves objects throughout bowl * Inlet and outlet rinsing ports * Adjustable amplitude 115V motor * Bowl diameter: 12 inches * 1-year warranty Note: We do not recommend using anything coarser than 120/220 in a vibratory tumbler.