The utility model discloses a split combined type drift size gauge tool, including drift size gauge tool body and joint, the both ends that connect are all designed to the pin thread, the one end design of drift size gauge tool body is the box, the one end pin thread that connects is connected with the box of drift size gauge tool body, and the weighted lever is connected to the other end of joint, the utility model discloses a more original drift size gauge tool of drift size gauge tool length totality shortens 5CM, follows the interior length of reducible instrument cluster income well to a certain extent, has reduced the instrument cluster and meet the risk that the card chance hinders in the well, the joint that designs can with this body coupling of drift size gauge tool of optional size, can satisfy the on -the -spot demand of temporarily changing the drift size gauge tool size, improved flexibility and operating efficiency that the instrument size was changed, the utility model discloses has single processing cost 500 practiced thrift to more original drift size gauge tool 800 the unit has practiced thrift the instrument processing cost.