Hardgrove Grindability Index SKU: MET-280 Category: Mining & Oil Description Additional information Description Specification : Geared motor 3phase 0,5 HP I 0.4 KW 220-380 V, 50 Hz 4 Pole 20rpm 8 Pieces steel ball. 1″ Diameter Additional information Quantity 1 Unit Related products Jaw Crusher 5 X 8 Inch Double Roll Crusher 20 Inch X 12 Inch Drying Seed Lab. Pulverizer