OEM‑compatible Mandrel (3115031200) for Boomer M2D, Boomer T1D, Boomer 291, Boomer L2D, Boomer S2, Boomer 282, COP-SC25, RD-14U, Boomer S1D, and Simba S7D. Made from hardened steel or alloy, this wear/structural spare part supports and aligns internal drilling components in hydraulic breaker and rock drill systems, ensuring stable operation and reliable performance in underground drilling equipment.