The Astro Pneumatic 3008 8" Gear Driven Random Orbital Sander with 8" Pad smooth strength and power of this gear driven sander removes heavy material and body filler on large, flat surfaces. Dual action pad motion leaves a clean swirl-free finish. Balanced ball bearing construction for vibration-free performance and long life. Specifications: Disc Size: 8", Free Speed: 850rpm, Overall Length: 11", Net Weight: 4-3/4lbs., Motor: 1/2hp, Air Inlet Thread NPT: 1/4", Air Hose I.D. Size: 3/8"/10mm, Avg. Air Consumption.: 5cfm, Air Pressure: 90-120psi.