Features High Efficiency: Designed to have a high speed of 70000RPM, this air die grinder will largely improve both work efficiency and performance. Wide in Utility: When connected to different accessories, the grinding machine can be applied to polishing, drilling, engraving and so on. Great Materials: Adopting premium alloy steel and tungsten carbide alloy, the pneumatic polisher is very durable with impact and long use. Smart Operation: Comfortable handle enables better control without causing burden on wrist and hand, making the operation more convenient. Simple Carrying: Comes with a compact size and a light weight, the grinder allows for simpler carrying for both indoor and outdoor works. Specification: Item Type: Pencil Die Grinder Material: Alloy steel, tungsten carbide alloy. No Load Speed: 70000rpm Chuck: Approx. 3mm / 0.12in, 1/8in Maximum Speed: 58000rpm or 65000rpm. Inlet Port: 1/4in Air Consumption: 0.021m³/min, 0.7ft³/min Air Pressure: 6.3kg/cm², 90ib/in². How to Use: Before and after each use, add 2‑3 drops of pneumatic lubricating oil to the air inlet, and then idle for a few seconds to complete the maintenance. Package List: 1 x Pencil Die Grinder 1 x Air Hose 2 x Wrench 1 x Oil Bottle 1 x Chuck 1 x Air Inlet Connector 1 x User Manual 1 x Storage Box Package List 1 x Pencil Die Grinder 1 x Air Hose 2 x Wrench 1 x Oil Bottle 1 x Chuck 1 x Air Inlet Connector 1 x User Manual 1 x Storage Box