Material: The bike hydraulic brake bleed bolts are made from titanium alloy, ensuring durability and resistance to wear. Specifications: The screw size is M6 with dimensions of 21x7x6mm, making it suitable for most bicycle disc brakes. Easy Installation: The bike brake bleeder screws and caps are easy to install, helping maintain clean and properly functioning brakes. Wide Compatibility: Designed to fit most bike hydraulic disc brake calipers on the market, compatible with mountain bikes, road bikes, BMX, and more. Package Includes: Each package includes 2 bleeder screws and 2 dust caps for comprehensive protection of your bicycle's brake system. Specifications: Material: Titanium Alloy Size: 21mm x 7mm x 6mm (0.83in x 0.28in x 0.24in) Package Includes: 2 x Bleeder Screws 2 x Dust Caps Note: Please allow slight variations of 1-2mm due to manual measurement.