OEM‑compatible Washer (3115505900) for Boomer M2D, Boomer T1D, Boomer XE3C, Boomer 291, Boomer L2D, Boomer S2, Boomer-282, Boomer M2C, and Boomer S1D underground mining drill rigs. Made from hardened steel, this aftermarket spare part provides durable load-bearing performance, ensuring reliable operation and extended service life under high-pressure drilling conditions.