Double Handle:This pneumatic engraving machine could be installed two engraving handpieces, you do not have to change the graver bits frequently. Please make sure the handpiece selector knob is correctly switched to the handpiece you want to use. Precise & Adjustable GaugeEquipped with pressure regulator and gauge you can select the appropriate pressure from high to low speed for precise engraving and read the pressure on gauge in time to ensuring better engraving effect. Speed Adjustable :The engraving handpiece can be freely controlled by the foot pedal. Vary the power input with the throttle to control the speed and depth of cut; And you also can adjust the stroke per minute to meet your engraving needs. It is very flexible, convenient and precise. Various Application:The pneumatic engraving machine fulfills the need for a machine capable of allowing rapid but precise cutting and carving of metal, stone, jade, and many other materials. The precise impact control feature of the machine also makes it an tool for stone setting, stippling, matte finishing on jewelry, stipple engraving on crystals, etc., Manufacturer: MMHHHG