MRE-320kw to 600kw new generation scrap preshredder for preshredding scrap bales, scarp car bales, junk cars, flattened car bodies with engine or without engine, fuel tanks etc.. Two rotor shafts with higher hydraulic motor torque input, higher revolution, direct motor drive, bigger tooth profile, high wear resistance, higher efficiency, more production, avoiding shredding explosion accidents. For existing shreeder or new shredder plants, low operation cost, high producton rates from 25tons~100tons/hour.