•Special design for precise grinding and fine polishing porcelain, Ziconia technician use high speed water spray turbine. •Its water spray function can cool down the heat caused by grinding, meanwhile reduce the dust and water spray prevent the case caused by the heat. •Low noise low vibration light torque. •Air pressure not to exceed 50 kgf/ cm2 (50psi) Specification Speed: 320,000~350,000 r.pm. Air pressure: 2.8~3.5 (bar)