The SM 6123 Starter EGT (Epicyclic Gear Train) Gear Set is a high-precision internal component kit specifically engineered for Bosch-style (B. Type) reduction starter motors. This set of three planetary gears is precision-machined to facilitate efficient torque multiplication within the starter's reduction assembly, ensuring reliable cranking for both small-displacement commercial diesel engines and high-performance petrol engines. Manufactured from high-tensile, heat-treated steel, these gears offer exceptional resistance to wear and tooth-shearing under frequent start-stop conditions.