Used to measure the degradation of mineral aggregates of standard gradings resulting from a combination of actions including abrasion or attrition, impact, and grinding in a rotating steel drum containing a specified number of steel spheres. Consists of a hollow steel cylinder, with a wall thickness of 12 mm (1/2) closed at both ends having an inside diameter of 711 mm (28), and an inside length of 508 mm (20). The drum rotates at 31 33 rpm. Power Supply : 220 V, 1 phase, 50Hz Dimensions: 950x1000x1100mm Weight: 350 kg Delivery time: 7 days after receipt of payment.