... metal,glass,wood,iron,steel,aluminum. Metal shredder GL61250 DescriptionAutomatic control by microcomputer (PC), with functions of start, stop, reverse, overload ... automatic reverse, feature return and over-loading returns automatism, with characteristics of big torque in low speed, low noise. Convenient ... the Speed Reducer, big torque in low speed. Metal Shredder Machine/Heavy Duty Shredder