1. The disc brake seat fixing screws for this mountain bike are made of a metal material, specifically titanium alloy, and feature a lightweight and hollowed-out design. Their specification is M6x18, and they belong to the category of hollow disc brake seat screws. Each bag contains 4 screws. 2. These screws are suitable for mountain bikes and can effectively fix the disc brake seat, providing stable braking support during the ride. In terms of quality, the titanium alloy material gives the screws good durability and strength, enabling them to withstand the challenges brought by various complex road conditions in mountain riding, ensuring that the disc brake seat is firmly installed and making the ride safer and more reliable. 3. They can be widely used in the assembly, maintenance, and upgrade scenarios of mountain bikes, and are a practical choice for mountain bike enthusiasts and maintenance personnel. With good adaptability and decent quality, they can meet users' different needs for fixing the disc brake seat of mountain bikes. 4. In addition, this product is sold in multiple regions such as Europe, South America, Southeast Asia, North America, and Northeast Asia, and has gained recognition from many users. Moreover, it has an authorized self - owned brand, and its quality is trustworthy.