1、SUITABLE FIXTURES: You can use different fixtures for grinding operations, you can clamp files or grinding tools, such as manual machining of grooves in molds or hardware products, R angles, etc. 2、DURABLE MATERIAL: The pencil die grinder body is made of aluminum alloy, sturdy and durable, can be used for a long time, and easily cope with various grinding needs 3、SURFACE REPAIR: Pneumatic engraving pen can be used for mold roughing and mirror polishing to quickly reduce the surface roughness of the working mold down to the lens, an irreplaceable effect by hand 4、FAST AND EFFICIENT: Air micro pencil grinder kit adopt accurate movement, long service life, can withstand 70,000 times per minute high reciprocating frequency, improve grinding speed, speed up work efficiency 5、WIDE APPLICATION: 1/4in pneumatic engraving pen is used for sanding, polishing, drilling, engraving, edging and deburring, useful and practical