1. metal material, reliable and durable in use.2. Compact size, light weight, high speed and low noise.3. Small air consumption, high concentricity, smooth running and wear-resistant.4. Good mechanical performance, a perfect tool for polishing and grinding.5. Suitable for grinding, trimming and shaping the of metal parts, wood components, rubber tires and castings.Spec:Features: metal material, reliable and durable in use. Compact size, light weight, high speed and low noise. Small air consumption, high concentricity, smooth running and wear-resistant. Good mechanical performance, a perfect tool for polishing and grinding. Suitable for grinding, trimming and shaping the of metal parts, wood components, rubber tires and castings.Specification:Material: Aluminum alloy & Iron & SteelAir Inlet Size: 1/4Chuck Size: 3mm/6mmWorking Pressure: 6.2kg/cm² Model (Optional) No-load Speed Pneumatic Grinders Length Weight #01 KP-620 25000rpm 15.5*3.3cm/6.1*1.3inch 467g/16.5oz #02 KP-621 22000rpm 17.5*4cm/6.9*1.6inch 732g/25.8oz Package List:1 x Pneumatic Grinders1 x 3mm Chuck1 x Inlet Interface2 x WrenchNote:1. Please allow slight error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.