Features SOPHISTICATED MANUFACTURING : Air tube connector is made of alloy steel, which is strong, wear‑resistant and practical.not only has strong power and precise sharpening operation, it is not only hard and stable, but also has a long service life. EASY OPERATION : The pneumatic sharpening pen is small size and light weight, light pen‑shaped designed, easy to use with one hand, Complete tools, you can operate it yourself, suitable for DIY enthusiasts WIDELY USED : The small portable grinding pen is suit for accurate grinding of various metals, grinding of various welding surfaces, cutting of plastic, stone, wood, etc. WONDERFUL GRINDING EFFECT : The pneumatic sanding pen has fast sanding speeds and powerful torques, which can make your sanding work easier and reduce your working time and energy which will make you more comfortable. EFFICIENT AND PRACTICAL : High‑speeds rotation, can adapt to high‑speeds processing, effectively improve work efficiency; Specification: Item Type: Pneumatic Grinding Machine Material: Alloy steel Average Speeds: 58000rpm up to: 65000rpm Air Consumption: 90i/min Working Pressure: 6-7map Inlet Size: Approx. 203.2mm / 8in Inner Diameter of Air Tube: Approx. 8mm / 0.3in Tube Length: Approx.113.1cm / 44.5in Pneumatic Grinding Pen Size: Approx.13.4 x 1.7cm / 5.3 x 0.7in Package List: 1 x Pneumatic Grinding Machine  2 x Wrench1 x Nozzle 1 x Oiler  1 x Chuck 1 x User Manual (Chinese and English ) Note: Manual measurement, please allow a little error Package List 1 x Pneumatic Grinding Machine (Pen Head Type Random) 2 x Wrench 1 x Nozzle 1 x Oiler 1 x Chuck 1 x User Manual (Chinese and English )