Description: 【Material】: This bike mechanical disc brake is made of quality aluminum, which is wear resistant and sturdy. It maintains its shape any time, ensuring long term use 【Features】: The bike disc brake features a double piston drive, keeping the disc centered at all times for smooth and stable braking 【Ease of use】: This line pulling disc brake is finely crafted with high strength. Its double sided pistons can be manually adjusted, making it easy to use 【Wide application】: This bicycle disc brake is ideal for various types of bikes including mountain bikes, road bikes, folding bikes, and adults bicycles 【Practical accessory】: The bike disc brake caliper makes a practical tool or accessory gift for your family or friends who love cycling or are professional bicycle repairers Specification: Material: Aluminum Size Chart:A Pillar: 7.5cm/2.95inch B Pillar: 5.1cm/2.01inch Package Includes:1 Bike Front Disc Brake Note: Please allow slightly errors 1-2cm differences due to manual measurement.