Description Overview Dual lane spiral concentrators 24" diameter Outotec model# MC7000 rougher spirals Seven turn (double start) Humphreys fiberglass spirals with polyurethane liner Specifications Measure 8-1/2" wide with 1-1/2" inner channel 4" diameter shaft 5" spacing between the spirals Includes dual discharge Condition Never put into production Very good condition Quantity Quantity: 6