.Non-Optic / .Length(101.8mm) .Stainless Steel Body / Hard Plating .Angular Ceramic Ball Bearing_German-made .Easy to change Ball Bearing & Cartridge .Internal Water(Quattro_4 Hole) Spray .Clean Head System .Speed: 360,000~440,000 RPM .Weight 53g .Autoclavable .Push Button Chuck .Ergo Hand Grip Design .Coupling Connection: NSK QD Coupling # COUPLING IS NOT INCLUDED.