Eteyo 1.5kw Water Cooled Spindle Motor for Numerical Engraving, Grinding, Milling Collet: Er11(3.175mm,4mm,6mm) Runout Off: Less Than 0.005mm This spindle motor adopts Germany imported bearing which can make it use for three times longer useful time than ordinary spindle motor. In extremely high speed working environment, ordinary bearing can not ensure this high rotate speed for using for long time. Our Germany imported bearing can make spindle motor three times longer useful time than ordinary spindle motor. The cost for Germany Imported Bearing is more than 150$ than ordinary bearing. why chooose this product. 1.MORE SPEED: 0-24000 R/min 2.MORE PRECISE 3.Collet: ER11(3.175mm,4mm,6mm) Runout off: less than 0.005mm 4.ISO9001 quality certifications which means this item is the top quanlity item Spindle Application 1.Wood working industry, such as wood door engraving and cutting, furniture producing. 2.2.Marble engraving inducstry, such as tombstone engraving, carved marble screens. 3.3.Advertising industry, such as acrylic, double color boards engraving. 4.4.Metal processing and so on.