... intervention.14. Non paint break-up after marking. pneumatic metal marking machine Marking contents:Arabic numerals, all kinds ... ,metal pipe,gear,pump,valve,fastening pieces,cylinder and various hardware. pneumatic metal marking machine Technical Parameters :Marking Range150 ... for adjustment,character size covers 2-80mm,even bigger Impact frequency 200—400HZHardness of work-pieceHRC≤60Repeat Precision± ...