PRODUCT INFORMATION: Flex-head design allows for setting the tool 25 forward or backward for clearance Forward and reverse dial, you choose where the sparks are thrown 0.8 horsepower motor, designed for full throttle heavy-duty applicationsSPECIFICATIONS:Wheel Size: 3" (75mm)Free Speed: 16,000 RPMOverall Length: 9.6" (243.84 mm)Net Weight: 2.9 lbs. (1.315 kgs)Air Consumption: 5.3 CFMPower: 0.8 HPAir Inlet Thread NPT: 1/4Air Pressure: 90 PSI (6.2 Bar).