M7-QA651B | M7 Mini Air Die Grinder 1/4in 18 000rpm FEATURES Superb quality pneumatic die grinder. SPECIFICATIONS Collet Size: 1/4 Free Speed: 18000 RPM Air Requirements: 2.7 CFM / 90 PSI Inlet: 1/4 Overall Length: 127mm Net Weight: 0.5kg Sound Pressure: 74 dBA Vibration Level: 0.3m/s²