The traditional fixed-back models directly connected to all standard tubings and are available in miniature and standard head sizes. SANDENT handpieces features the NSK clean head system and have a single water spray. What is clean head system? Clean head system is specially designed to prevent the the liquid in the mouth from entering the head of the handpiece, thus decrease the possibility of cross-infection. Meanwhile the air turbine within the head takes Germany balancing technology,extending the bearing life. Description: Precise Monoblock Axes single-way spray Healthy Machine Head System Push Button Needle Change Type Sterilization can be done with High-temperature and High-pressure repeatedly Rated Air-pressure : 177-216Kpa(1.8-2.2kgf/cm2) Rotating Speed Without Load :400,000RPM Needle Change Type: Push Button Specifications: Speed: 380,000~480,000 min-1 Head Size: ø10.3 x H13.5 mm