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They are designed to carry up to 7 sieves of 8 inch diameter and 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 an oil bath. The tapping motion is given by hammer from top. To work on 220/ 230 volts single phase A.C. Supplied complete with adptor for 8 inch sieves but without test sieves.