OEM‑compatible Expanding Shaft (3125198280) for Simba E70, Boomer M2D, Boomer T1D, Simba E7C, Boomer 291, Boomer 281, Boltec 235, Boltec MC, Boomer L2D, Boomer 282, Boomer M2C, Boomer MD, 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, enhancing equipment performance and extending service life.