Description: 【Wide Compatibility】Specially designed for , trombone, and baritone water key systems, this central axis screw features a standard size that ensures fit various brass instruments 【Premium Material】Crafted from quality stainless steel, this Water Key Spit Valve screw is resistant to rust, making it ideal for long term use in moisture rich environments typical of brass instrument performance 【Precision Engineering】Brass instrument drain valve screw CNC machined threads provide smooth installation without jamming, enhancing the seal overall sensitivity of the water key mechanism 【Enhanced Performance】Replacing old or damaged screws restores the original feel of your water key action, allowing smoother drainage and minimizing moisture buildup that can affect sound quality 【Construction】Brass instrument drain key screw reinforced central axis design withstands frequent pressing without bending or deforming, ensuring long term durability for both professional musicians and students Specification: Material: Stainless Steel Size Chart: 0.4cmx1.3cm/0.16inchx0.51inch Package Includes: 1 or 3 Water Key Screw(As your choice) Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.