Ampro A3003 Precision Air Micro Die Grinder 110" Angle head design Ideal for tight spots Designed for high speed porting and finishing of small parts Blow molded case for easy storage and transportation Collet Size: 1/8"; Free Speed (RPM): 70,000; Ave. Air Consumption (CFM): 1.0 ; Air Pressure (PSI): 90; Air Inlet (NPT/PT): 1/4"; Hose Size (ID): 3/8"