Specification: Name: Multi-Function Pneumatic Grinder Model: YT-3719 Grinding Wheel Diameter: 4 Inch (100MM) Working Air Pressure: 0.62Mpa (90PSI) Air Consumption: 10M3/H Air Pipe Size: 3/8 Inch Air Inlet Fitting: 1/4 Inch No-load Speed: 10,000RPM±10% Weight: 1.3KG