... on breaking point ,processing time anticipation,and auto=feeding blades.4.Strong functions, easy operation, sturdy, durable, reliable performance, ... , any copper molds, mini die molds, stainless steel chest-brand, copper seals, making on the working piece, copper electrodes, ... )7.Vacuum System(optional) 1500W 300x250x40mm SD3025MV Mini CNC Router CNC Engraver processing small precision instruments