-The sliding archwire locks can be slipped over the archwire and fixed in place by turning the nut tight with the Double Ended Wrench. The locks can be loosened and moved when desired. An excellent option to maintain anchorage, distalize molars and provide a stop or hook when necessary. -Kit Includes: (5) sets of right locks. -(5) sets of left locks. -(5) sets of universal locks. -(1) Double Ended Wrench . **For further product information, please contact Chat Support**