The Eastwood 2” Surface Prep Tool is a heavy-duty professional quality tool ruggedly designed for many years of reliable service. Variable speed.5 vane, ball bearing air motor. Infinitely progressive trigger control. Lightweight composite housing Features a strong, lightweight composite housing for comfort and durability. A high-torque, 5-vane, ball bearing air motor provide smooth operation and long life. Speed is easily controlled with an infinitely progressive trigger control. RPM: 18,000 free speed. Air Consumption: 3.5 CFM @90 PSI [6.3bar]. Inlet thread size: 1/4” FNPT. Required Surface Prep Disc: 2” 3M Roloc™ Style, minimum 18,000 RPM.