Periodontist-recommended set comes equipped with everything you need to help treat the removal of deep subgingival calculus, deep scaling, and root planing. Kit includes Medium Flat Cassette 94-170, 204S Posterior Sickle Scaler 39-204S, UNC15 Probe 35-2UNC15, #5 Cone Socket mouth mirror with hollow handle 29-100, and all 9 Gracey Curettes. Twist button locking mechanism Detachable lid for ease of access Includes 12 instruments