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. Model:ER20(60)-drilling waterproof. Rising Temperature:within 25 Degree Celsius. Spindle Material:20CrmnTi, carburizing heat treatment. 1X ER20(60)-drilling waterproof. Feedback is very important to us. It is impossible to address issues if we do not know about them! Faction is our ultimate goal. We work hard to earn your trust and future business. A If you receive a defective item, you may return it or ask for a discount. Due to time zones, our reply to your questions may not be immediately. If it's non-workdays, please kindly be patient and wait till Monday.