Nagasawa Seisakusho Solid Silver Neck Screw GP for Yanagisawa/Selmer, 950 Silver (Casting/Lathe Processing) This neck screw delivers exceptional pronunciation and a brilliant sound. With a clear sound across the entire range, it offers excellent response and ease of play in the high register, performing well from baritone to soprano saxophones. Specifications: Screw Head: Approximately φ12.3-13mm Total Length: 29mm Screw Standard: M4-0.75 950 Silver GP Compatible with: Yanagisawa Selmer models. Supreme model compatibility not confirmed. Nagasawa Seisakusho: The maker himself has won awards in international competitions. Based on this experience, he has repeatedly tested and prototyped, and designs and manufactures 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 #NeckScrew #Yanagisawa #Selmer