The Sieve Shaker S 20x4 (on base VD 50) are designed for intermittent dry sieving of bulk materials according to particle size. The Sieve Shaker consists of a vibration drive with a set of sieves installed, a tray, a cover and a device for fastening the sieves.
See more: http://vibrotechnik.com/catalog/sieving-equipment/sieve-shakers/
Characteristics S 20x4