This neck is made specifically for Conn tenor saxophones (10M, 30M, 16M) and has a 28.4mm tenon. The tenon size and mechanism may need to be slightly adjusted to fit your individual horn, which is a quick, easy, and quite inexpensive procedure that can be done by any repair shop. This neck will greatly improve your dynamic range, reduce resistance, and make the altissimo much easier. It is heavily hand engraved and finished in the finest quality gold lacquer available. This neck also includes our Saxgourmet neck case