Features: High quality 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 surface of metal parts, wood components, rubber tires and castings. Specification: Material: Aluminum alloy & Iron & Steel Air Inlet Size: 1/4 Chuck Size: 3mm/6mm Working 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 Grinders 1 x 3mm Chuck 1 x Inlet Interface 2 x Wrench Note: 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.