Angle Air Die Grinder Set This set is compact and lightweight for ease of maneuverability that is ideal for most industrial applications. This 0.3 horsepower motor offers 22,000 RPM. Features include... 22,000 RPM 0.3 Horsepower 1/4" Spindle 4 CFM @ 90 PSI NPT air inlet: 1/4" 10 different grinding wheels