... in order to mark at the right position on the workpieces.1marking on flat surface 2 esay to marking3electro-magnet marking machine4 ... mm2)InstructionNCQ/C-135-85135*85With rubber plate, to mark on heavy and big work piecesNCQ/C2-135-85135-85With electro ... engine.Applicable scopemark serial numbers,manufacture date,name,brand,etc on body,framework,base plate,pillar,engine,and other big ,heavy materials ...