The Holder set (OEM Part No. 3128314013) is a spare part compatible with M2D, T1D, Boomer XE3C, Boomer 291, Boomer 281, S7D, BMH Epiroc, Boomer L2D, Boomer-281, boomer-282, BOOMER-M2C and S7D-1 underground drilling rigs. Manufactured from durable alloy steel, it is designed as a structural component for the drill tool fixing & supporting system at the holder mount structural position. It firmly clamps drilling tools and auxiliary pipelines to prevent shifting under strong vibration during underground mining work. Its high-rigidity alloy steel construction delivers precise OEM fitting, stable supporting force and extended service life to guarantee consistent equipment operation.