ARKSEN Air Micro Grinder Pencil Type Grinder 56,000RPM 1/8" Die Grinder, w/Carrying Case Includes Micro Grinder With 60" Hose, 2 Piece Chuck Wrench, Coupler And Inline Oiler Free speed: 65,000RPM Collet Size: 1/8", Air Inlet: 1/4" NPT Air Pressure: 90PSI, Avg Air Consumption: 2CFM Suggested Air Compressor: 1HP And Above