Rotate to adjust the speed to meet the work needs. Self locking collet, more stable. Come with 6pcs ISO collects. (M3, M4, M5, M6-8, M10, M12).Function: Torque protected / No Torque protected. Tapping range: M3-M12 6 chucks: M3, M4, M5, M6-8, M10, M12. Purpose: suitable for all kinds of nut riveting products. Unused/unopened merchandise will be fully credited. All emails will be answered within 24 hours.