The Arm (OEM Part No. 3128314278) is a spare part compatible with Simba S7D underground drilling rigs. Manufactured from durable alloy steel, it functions as a structural component for the drilling rig boom support assembly at the swing arm mount position. This heavy-duty swing arm bears the weight of the drill boom and absorbs strong vibration during drilling operations, maintaining stable boom positioning and swing performance. The high-rigidity alloy steel construction provides outstanding load capacity, precise OEM fit and reliable structural support for long-term mining work.