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The retrievable fishing jar is an efficient fishing tool used in oil drilling and well servicing operations, mainly for grabbing and recovering small objects dropped inside the well (such as bolts, plier teeth, scrap iron, etc.). Its unique design allows for safe withdrawal after grabbing, avoiding the risk of tool sticking.

The external hook is a tool used to retrieve various ropes, lifting rings, hollow short cylindrical bodies, short ropes, and other dropped objects from inside casings or tubing, such as steel wire ropes, logging wire, cables, etc.