LORTONE Model QT-12
The QT12 is the largest tumbler available on a regular basis. (If you would like to do more, larger rocks, 20 lb. and 40 lb. tumblers are available by special order. These are built by Lortone when ordered, so there may be a small delay in getting these sizes for you.) The QT12 requires 12 lbs. of rock and, again, a mixture of sizes is necessary to get the best polish on your rocks.