This knurled head screw for French horn is designed to provide a secure and stable connection for your instrument's keys. Crafted with precision, it ensures smooth operation and reliable performance. Ideal for both professional musicians and students, this accessory enhances the longevity of your instrument. Features -Color:Golden -Material:Metal -Size:0.79X0.79X0.65cm/0.31X0.31X0.26in -Knurled cap design: the horn knurled cap screw ensures that the keys remain stable and do not loosen, enhancing the stability of your performance -Triple flat key structure: the triple flat key structure effectively reduces key noise, creating a purer musical experience -For horn: specifically designed for horn with four keys, it precisely matches and easily your instrument's performance -Easy installation: the upper bass horn key fixing nut allows for simple installation and quick adjustments, catering to various performance needs -Professional instrument accessory: crafted with precision, this instrument accessory is durable and adds brilliance to your performance Package list: 1 x french horn rotor screw