Maxwolf 2.2KW Water Cooled Spindle Motor High Speed for Engraving Milling Grinding (2.2KW Water Cooled Spindle Motor) Power: 2.2 KW;Voltage: 220V~250V Collet: ER20(4mm,6mm,8mm,12mm,12.7mm);Runout off: less than 0.005mm Speed:8000-24000 R/min;Frequency: 400 Hz Our bearing can make spindle motor three times longer useful time than ordinary spindle motor. High quality Spindle with stainless steel 304 casing