Compatible with brake mechanism of ZF 12-speed AMT series gearboxes, integrally processed by precision turning and grinding with high-quality alloy steel, featuring high hardness, wear resistance and shear deformation resistance. Made in strict accordance with original tolerance standard with reasonable assembly clearance and smooth transmission without jamming. Treated with special anti-rust and anti-corrosion surface process, it adapts to oily and humid working environment of gearbox. With accurate positioning and even stress bearing, it stably transmits braking force and supports long-term stable operation of brake assembly.