1. The fixing screws for the disc brake calipers of this mountain bike are made of metal, specifically titanium alloy. They are of good quality, sturdy and durable, and can provide a stable and reliable fixing function for the bicycle disc brake system. 2. There are multiple specifications available, including M6x16, M6x18, and M6x20, which can meet different needs of users for fixing bicycle disc brake calipers. Each bag contains 4 disc brake caliper screws, and this packaging specification makes it convenient for users to use and stock according to the actual situation. 3. It has relatively wide applicability and is suitable for mountain bikes used by male, female, and neutral users. In terms of sales scope, it is quite popular among consumers in regions such as Europe, South America, Southeast Asia, North America, and Northeast Asia. In addition, it has an authorized own - brand, and the quality is guaranteed. 4. Whether for daily cycling or professional mountain bike sports, these disc brake caliper fixing screws are a trustworthy choice, which can ensure cycling safety and enhance the cycling experience.