Rotary Tumbler w/ Digital Read Out FOREDOMForedoms new direct drive rotary tumbler is excellent for burnishing gold, silver, and other metals. This efficient, compact rotary tumbler with programmable controls makes repeatable processes easy to select. Set the timer, choose the direction of rotation, and select from 20 levels of speed control ranging from 5 to 100 rpm. Work cycle duration is 180 minutes long. Your work in progress is visible through the clear, leak proof, hexagonal barrel.