The wear-proof sub is a special protective tool designed to prevent excessive wear on drill pipe tool joints caused by hard formation contact. It is placed between drill collars and drill pipe to reduce rotational wear on the drill string. PetroZHR wear-proof subs feature high-hardness tungsten carbide hardfacing on the outer surface, providing excellent wear resistance and significantly extending the service life of drill pipe. The sub body is manufactured from high-strength alloy steel and conforms to API connection standards. Available in a full range of sizes and connection types to match different drill string configurations.