... and hard objects. 3.Such as metal,glass,wood,iron,steel,aluminum. Metal shredder GL61250 DescriptionAutomatic control by microcomputer ( ... :1.Standard Rotor-knives is 75mm, optional 50mm or 100mm, and it is also available to choose ... blade body by default. For double blade body or multi blade, please confirm with our sales.3 ... Reducer, big torque in low speed. Metal Shredder Machine/Heavy Duty Shredder