... nine files simultaneously, power off restoring, continuation on breaking point ,processing time anticipation,and auto=feeding blades.4.Strong ... images engraving on copper, aluminum products, any copper molds, mini die molds, stainless steel chest-brand, copper seals, making ... )7.Vacuum System(optional) 1500W 300x250x40mm SD3025MV Mini CNC Router CNC Engraver processing small precision instruments