Portable air operated direct drive mixer by tonson, serial # 100111251. Features . 93 horsepower air motor with adjustable tilting clamp mount, 26" long stainless steel shaft with coupling included in length measurement, 6" three blade propellor, npt inlet and outlet air connections, rotary vane motor, mfg plate illegable but matches published model ts-50-r-v2, speed up to 1750 rpm.