Lortone Model QT66 Rotary Tumbler Great For Tumbling Rocks. This is a new Lortone model 45C rotary tumbler. It runs on 115V, 60Hz. This model QT66 Lortone rotary tumbler is quite simple to operate and gives excellent results. It includes two 6 lb molded rubber barrels with quick seal closure. The motor is internally fan cooled. The barrels measure approximately 3 5/8" deep x 5 3/4" diameter (81 x 146 mm). The base measures approximately 11" x 12 1/2" (279 x 317 mm).