OEM‑compatible Roller Bearing (3128078427) for Boltec S10M, Boomer M2D, Boltec S, Boomer XE3C, Simba S7D, Boltec 235, Boltec MC, Boomer L2D, Boomer M2C, Boomer MD, ROC-D7, ROC-D9, Boomer S1D, Boomer S2, and Boomer T1D underground drilling equipment. Made from hardened steel, this aftermarket spare part is part of the rotation head assembly, ensuring smooth and reliable operation, extended service life, and enhanced performance in demanding underground drilling applications.