Electric Engraving Pen Electric Grinder Pen for Carving Metal Drilling Description: 【Cordless Electric Grinder】: Wireless engraving pen polisher set, the lowest speed will let you polishing, the highest speed are also working on metal carving. 【Features】: USB charging, low noise work. 3 speed options 5000-10000-20000r/min, the body is made of alloy material, good heat dissipation, making your artwork diy. 【Various Grinding Bit】: 30Pcs different polishing bits for carving, polishing, cutting…