Set Includes: 1/4" Right Angle Die Grinder; No load speed: 20,000 rpm; 1/4" air inlet; Recommended Air Pressure: 90 psi; Average Air Consumption: 2.2 CFM; 1/4" Mini Die Grinder; No load speed: 25,000 rpm; 1/4" air inlet; Recommended Air Pressure: 90 psi; Average Air Consumption: 3 CFM