OEM‑compatible Washer (3128078536) for 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, and Boomer S1D underground drilling equipment. Made from hardened steel, this aftermarket spare part is used in the rotation head assembly of drilling equipment, ensuring durable and reliable performance in mining operations.