Nagasawa Seisakusho Solid Silver Lyre Screw GP for Selmer, 950 Silver (Casting & Lathe Processing) This lyre screw is finished with excellent pronunciation and a brilliant sound. Along with a clear sound across the entire range, the response and ease of hitting high notes are very good, so please try it. Specifications Screw Head: Approx. φ12.3-13mm Total Length: 26mm Screw Standard: M4-0.75 950 Silver GP Can be used for Selmer-type instruments with a lyre socket. At Nagasawa Seisakusho, The maker himself has won awards in international competitions, and based on that experience, he has repeatedly tested and prototyped, and is designing and manufacturing solid silver wind instrument boost items in his workshop in Hatoyama-machi, Hiki-gun, Saitama Prefecture. We have our own online shop. Search for Nagasawa Seisakusho! #NagasawaSeisakusho #LyreScrew #Selmer #Saxophone