... :1200mm 3.packing:20ft 4.producing time:7days Spiral chtue1.Glass steel rotary spiral chute, shaker, centrifugal concentrating machine features, in 1977 ... , strong adaptability, already batch production, wide application. Specification of Gold spiral chute gravity machineModelOD mmScrew pitch mmRatio Screw pitch/diameterAngle ° Max ...