1. This single - chainring disc bolt screw for mountain BMX bikes is made of titanium alloy and has a size of 6.5 mm. It comes in a lockable disc bolt combination (screw + nut). 2. It is suitable for mountain BMX bikes and is specifically designed for single - chainrings. It can be a good fit for the usage scenarios of mountain riding and BMX bikes. The XT - material metal it uses is of a decent quality, being sturdy and durable. It can provide a relatively stable fixing effect for the chainring, ensuring the stability of the chainring during the ride and making the ride safer and more reliable. 3. This disc bolt screw is suitable for various riding scenarios and can be widely used in activities such as daily riding and mountain exploration. It is a good option for bike enthusiasts to upgrade or repair their favorite bikes, effectively enhancing the overall performance and usage experience of the bike. 4. This product is sold in regions such as Europe, South America, Southeast Asia, North America, Northeast Asia, and the Middle East, and its quality is trustworthy.