To carry upto 7 sieves of 8" dia it is driven by 1/4 HP electric motor, through reduction gear. The whole gear mechanism which gives circular end to end motion runs in oil bath. The tapping motion is given by hammer from top. Works on 220/230 volts single phase AC. Supplied complete with adaptor for 8" sieve but without test sieve. Fitted with AUE/GE/CROMPTION/EQUIVALENT MOTOR.