Dental 1:5 Increasing Contra Angle Compatible with E-type Electric Motor. Specification: Gear Ratio:1:5 Ceramic bearing Rotation Speed:Max.1.59-1.60mm Connector: E-type Chuck Type: Push Button Water Spray: Internal four way spray. The sale of this item may be subject to regulation by the U. Food and Drug Administration and state and local regulatory agencies. If the item you received is damaged or defective, Please tell us immidately. Our guarantee does not cover accidental damage or wear of product caused by customer. Thank you very much for your understanding! You feedback is VERY important to us. We understand the concerns and frustrations you might have, and will try our best to resolve the issues. Service is our #1 priority at BAISTRA! If you tell us immediately after placing the order, we will make every effort to assist you with your change request. We offer the best items at the best prices. We strive to exceed all your expectations and put a smile on your face. We stand behind our products and pride ourselves on OUTSTANDING customer service.