The Telescope set (OEM Part No. 3128315032) is a spare part compatible with Boomer-281 underground drilling rigs. Manufactured from durable alloy steel, it serves as a structural component for the drilling arm main load assembly at the primary boom structural position. As the core telescopic assembly of the drill arm, it bears heavy drilling loads and realizes stretch and retraction of the feed beam. The high-rigidity alloy steel construction effectively resists bending and deformation, maintaining stable drilling positioning and continuous reliable operation of Boomer-281 tunneling equipment.