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Thumler's A-R1 Rock Tumbler & Accessories Great For Tumbling Rocks. This is a new rock tumbler with accessories. Rotary tumblers polish rocks, stones, coins, clean cartridges, polish brass and other metals. They are extensively used by serious hobbyists, laboratories, schools and industry for an unlimited variety of tumbling and mixing operations. Polish rocks and stones to reveal their long hidden natural beauty. Create stunning jewelry with gem like polished stones. Professional quality rock polisher offers years of pleasure. Continuous duty motor is impedance protected. Made in the U.S.A. You receive:. One model AR-1 rock tumbler. It runs on 110V, 60Hz. 1 quart rubber tumbling barrel, holds 3 lbs of rocks. The barrel interior measures 4 1/4" diameter x 4" deep (107 x 101 mm). 4 grades of polishing abrasives. 1 lb of tumbling rock. Jewelry findings. Instruction booklet "A Guide for Rock Polishers".