Check the listing for details. ER20 Spindle Unit Drilling Milling Boring Power Head 5000~6000 CNC Machine UPS. Condition: New. Listed at 129.68 USD. ER20 Power Head Spindle 5000-6000rpm Waterproof Boring/Milling/Drilling Tool CNC Product description; ★The power milling head is a universal power component, which is combined with a milling machine or a power slide to supplement various types of support components, thereby forming various forms of combined milling machines. Used in various special machinery. ★Higher accuracy, better stability, more stable operation, double waterproof design structure, ★Isolate cutting fluid and dust during production and processing to ensure that the spindle head is in good condition in actual work (only some models have waterproof function). ★The spindle box is made of high toughness cast iron. After manual and natural double aging treatment, it is wear-resistant and not easily deformed. Featu.