Heavy duty(Improved Model ) FOR 8 ",12" & 18" TEST SIEVES The Rotap Sieve shaker is durably constructed and is run by ΒΌ H.P. Electric MOTOR 220 Volts A.C through reduction gear. Designed to carry upto 67 TEST SIEVES of 200 mm Dia (8") with one set lid & pan. It reproduces circular and hammering motion. Revolution approx.: 280 to 320 R.P.M and tapping approx.: 140 R.P.M to 160 R.P.M No foundations are required.