Features: The air-powered function could reduce dust and improve environment protection, poses no electric hazards, and the side exhaust keeps exhaust away from your stone. Suede sandpaper can stick to grinding disc, you can choose sandpaper in different grit. Low vibrate and noise with excellent performance. Light weight and non-slip handle design for comfortable grip. Widely used in marble, granite and other stone material polishing work. Specification:Working pressure: 6-8mpaInlet size: 1/4Weight: Approx.1638g/ 57.8ozNo-load speed: 4300rpmSuitable gas pipe: 8*5mm/ 0.3*0.2inGrinding disc Dia.: 75mm/ 3inPackage List:1 * Air Polisher1 * 1/4 Inlet connector1 * Hose1 * Water pipe1 * Grinding discNote:Please allow slight error due to manual measurement. Thanks for your understanding.