The Astro Pneumatic 300SP 6″ DAQ Random Orbital Sander with Pad – Regular Duty – 9,000rpm DAQ – Dual Action, Quiet Performance. Used for feather edging, metal preparation and finish work on body filler. Built-in silencer and motor insulation provides quiet operation. Balanced ball bearing construction for vibration-free performance. Built-in regulator for positive speed control. Specifications: Disc Size: 6″, Free Speed: 9,000rpm, Orbit: 3/8″(9.5mm) Orbit Stroke, Overall Length: 9-1/2″ (241mm), Net Weight: 4-1/4lbs. (1.92kg), Spindle Thread Size: 5/16″-24, Air Inlet Thread NPT: 1/4″, Air Hose I.D. Size: 3/8″ (10mm), Avg. Air Consumption: 5cfm, Air Pressure: 90-120psi.