This is a GRS engraving system which gives each hand-piece excellent range of power with perfect control throughout an expanded range of impact speeds. Advanced ergonomics include front air pressure adjustment, quick change air couplings, rear mount throttle connection, and an advanced valve pulse unit that operates with virtually no noise or vibration. This machine has connections for two impact hand-pieces plus an auxiliary air connection for other air tools, including the GRS ultra 850 rotary hand-piece.