These are axle parts of large special-purpose vehicles. From among these, DIFF.HSG part is a standard component assembled of Axle and regulated by not only precision but geometric tolerance. In case of HUB WHEEL and WHEEL COVER, precision turning & MCT processing skill is necessary to absorb strong force and vibration at high speed. STEERING ARM needs steering force transmission function. The parts of OS program require stronger durability than ones of general commercial vehicles. So it is not easy to produce these parts due to the difficulty of machining workpiece materials.