MRE-320kw new generation scrap preshredder for preshredding scrap bales, car bales, whole 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, producton rates from 25tons~60tons/hour depending on in feed density.