Affordable ultra-high rotation speed up to 75,000 RPM! Max. RPM 75,000 Tool shank Ø 3 mm, 4 mm, 6 mm Driven by coolant, cutting oil, air mist Coolant pressure 10-60 bar (145-870 PSI) for CoolSpeed® mini Air mist pressure 4-5 bar (58-73 PSI) for CoolSpeed® mini Air 2