OEM‑compatible Lock Washer (0333520012) for FlexiROC D65, Roc L6, Boomer M2D, Roc L8, Boomer M2C, PowerRoc‑D55, ROC PRT50, Boomer S1D, and Scooptram/ST‑3.5 drilling equipment. Made from durable metal, this wear/fastener spare part prevents fasteners from loosening under vibration in drilling and mining equipment, ensuring secure and reliable operation in hydraulic breaker and rock drill systems.