... inverter-driven spindle motor cooled naturally.2.Application:advertising,stamps processing,handcrafts and specializing accurte instrument industries. ... , sturdy, durable, reliable performance, reasonable price, suitable for letters, images engraving on copper, aluminum products, any copper ... )7.Vacuum System(optional) CNC Engraver/router SD3025V 300x250x40mm 800W for advertising wooden aluminum