OEM‑compatible Lock Washer (0333612300) for Simba E70, Simba M4C, Boomer M2D, Simba E7C, Simba M40S, Boltec‑MC, and Boomer‑M2C 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.