1Applicable Materials: With a no load speed of 65000rpm, this pneumatic engraving pen is suitable for hard steel, metal, glass, stone, ceramics, plastic, and other materials, making it efficient and practical. 2Portable Design: This pneumatic engraving pen is lightweight and portable, and can be applied with one hand to improve work efficiency. It is very suitable for narrow areas, making it easy to store and carry. 3Excellent Metal Gear: The air die grinder pen adopts tungsten steel alloy gear set, which has strong wear resistance and longer service life, and has no deformation, suitable for various processing environments. 4Standard Accessories: This pneumatic grinding pen has standard NPT1/4 inch hose interface, a air consumption of 0.2m/min, and is equipped with M3 chuck, with M2.3 and M3 chuck capabilities. 5Versatile Use: This pneumatic engraver pen helps with debugging, reshaping notches on screw heads or broken bolts for easy disassembly, as well as personalized tools and other equipment in the workshop. 1 x Engraving Pen 2 x Special Adjustment Tools 1 x Engraving Grinding Head