Features 1、Sturdy And Robust: This pneumatic pencil die grinder is made of excellent alloy steel and tungsten steel alloy material, which is not easy to be damaged and has superb abrasion resistance and a long service life. 2、70,000RPM Maximum Speed: This pneumatic air pencil die grinder's bearings can reach a super high speed of 70,000RPM, which improves the grinding speed and efficiency, and is very practical. 3、Lightweight And Portable: This mini pencil polishing cutting tool is small in size and light in weight, can be used with one hand, perfect for some narrow areas, easy to use, easy to load and unload, easy to carry. 4、Multifunctional: This pencil type die grinder is multifunctional and helps with debugging, reshaping screw heads or cut outs on broken bolts for easier removal, and of course helping to individualize tools and other equipment in the workshop. 5、Wide Application: This air pencil die grinder has a wide range of applications, it is used to write on hard steel, metal, glass, stone, ceramics, plastics and other materials, which can be used in the automotive industry, aerospace, metal fabrication, electronics industry and so on. Specification Item Type: Pneumatic Pencil Die Grinder Material: Alloy Steel, Tungsten Steel Alloy Compatible Collet: Approx. 2.38mm / 0.09in, 3mm / 0.12in (With 3mm Collet) Maximum Speed: 70,000RPM Air Hose Connector: NPT 1/4 Inch Package List 1 x Pencil Die Grinder 1 x Air Tube 2 x Special Adjustment Tools 1 x Storage Box 1 x Collet 1 x Air Tube Interface 10 x Grinding Bits 1 x Manual