NSK Self-power LED High Speed Handpiece Push Button Midwest 4Holes SpecificationsHead Standard HeadPower 16WRotation 330,000~430,000 min-1Head Size Ø12.1 x H13.3 mmWater Spray Quattro SprayBody Material StainlessFeaturesCellular Glass Optics / Ceramic Bearings / Clean Head System / Push Button Chuck