The Shim (OEM Part No. 3128309369) is a spare part compatible with Meishan M4C, Dominican M4C, M40S, M4C, Simba H1354, and M4C ITH underground drilling rigs. Manufactured from durable steel, it is designed as a mechanical component for alignment, clearance adjustment, and support systems at the shim adjustment position. The shim provides precise spacing and adjustment between assembled components, helping maintain correct alignment and improve equipment stability. Its reliable construction ensures accurate fitting, long service life, and dependable performance under demanding underground mining conditions. This OEM replacement shim supports proper assembly and efficient operation of drilling equipment.