The SM 4242 is a precision-engineered Self Starter Rocker Assembly (Brush Holder) designed for Bosch-style (B.TYPE) starter motors. This assembly is a primary replacement part for the Maruti Suzuki Swift (Petrol) and other vehicles utilizing the Suzuki K-Series engine (K12). Featuring a high-efficiency 4-brush configuration, it is built to provide the rapid field excitation and quiet cranking required for modern fuel-injected engines.