OEM‑compatible Expanding Shaft (3125496880) for Boltec S10M, Boltec S, Boomer 291, Boomer 281, Simba S7D, Boomer S2, Boomer 282, and Boomer S1D underground mining drill rigs. Made from hardened steel, this aftermarket spare part ensures durable and reliable operation in demanding drilling applications. Its robust construction enhances equipment performance and extends service life.