FDG180m For polishing, buffing, deburring and grinding. Rubber handle provides grip and operator comfort. Speed regulator, safety release throttle, rear exhaust, ball bearing construction for long tool life. Contents: mini die grinder, two collet spanners and instructions. Collet size: 1/4 (6mm). Air inlet thread: 1/4 NPT. Minimum air hose size (ID): 3/8 (10mm). Air pressure: 90psi/6.3bar. Air consumption: 4cfm* (144ltr/min). Sound pressure level: 91dBA. Sound power level: 98dBA. Vibration level: 4.53m/s2. Overall length: 158mm. *Based on a 15 second cycle per minute average use.