1MAIN PURPOSE: These trumpet pitch screws are mainly used to secure the trumpet sound tube, ensuring a more stable and smoother performance. 2NON SLIP DESIGN: These trumpet sound pipe screws are non slip design, will not slide or fall off after installation, which is stable and reliable. 3METAL MATERIAL: These trumpet repair screws are made of excellent metal material, with high hardness, wear resistance, and scratch resistance. 4FINE WORKMANSHIP: With exquisite workmanship, these trumpet pitch screws have a glossy appearance and delicate texture, making them safer to use. 5EASY INSTALLATION: Includes 3pcs trumpet screws, compact and lightweight, easy to install and replace, suitable for professional players or beginners to use. 3 x Trumpet Slide Screws