OEM‑compatible Washer (3128047600) for FlexiROC D65, Boomer M2D, Boomer T1D, Boomer XE3C, Boomer 291, Boomer 281, Simba S7D, Boomer L2D, Boomer S2, Boomer 282, Boomer M2C, COP MD20, ROC-D7, ROC-D9, ROC PRT50, and Boomer S1D underground drilling equipment. Made from hardened steel, this aftermarket spare part is part of the rotation head assembly, ensuring durable and reliable operation in mining and tunneling applications. Its robust construction extends service life and enhances performance in demanding underground environments.