OEM‑compatible Expanding Shaft (3125493780) for Boomer M2D, Boomer T1D, Boomer 291, Boomer 281, Boomer-282, Boomer M2C, and Boomer S1D underground mining drill rigs. Made from hardened steel, this aftermarket spare part ensures durable and reliable operation under high-load drilling conditions, improving equipment performance and service life.