... off restoring, continuation on breaking point ,processing time anticipation,and auto=feeding blades.4.Strong functions, easy operation, ... reasonable price, suitable for letters, images engraving on copper, aluminum products, any copper molds, mini die molds, stainless steel ... 7.Vacuum System(optional) 1500W 300x250x40mm SD3025MV Mini CNC Router CNC Engraver processing small precision instruments