REMco VSI RockMax Crushers are autogenous vertical shaft crushing machines designed to operate as third stage crushers in the processing of all types of rock, ores and minerals. RockMax crushers can be operated in either open or closed-circuit. Closed-circuit operation is recommended in order to achieve the lowest net operating cost, best particle shape and the highest production. RockMax crushers are intended for producing crushed products between 1 1/2 to 3/8 / 40mm to 10mm.