CST Tapmatic ASR50 VST Axial Tapping Attachment ER16 M4.5-M12 32161. No base adapter or collets included. 2500 RPM. High speed self reversing tapping for fastest cycle time. Made in USA. Smooth operation and gear teeth look good. Please review all photos to determine condition and identification. Please confirm this part will meet your desired application prior to purchasing. Item is sold as is with No Returns. Will be shipped via USPS Priority.