Fishing magnet is generally used to catch and take out small magnetic fish such as drill bit gear, cone, shaft, grapple, pliers and debris that fall into the bottom of the well during drilling and workover operations. Fishing magnet is divided into normal circulation fishing magnet, reverse circulation fishing magnet and high-power fishing magnet. As for normal circulation fishing magnet and reverse circulation fishing magnet, they can also handle small non-magnetic fish. The magnet assembly provides powerful magnetic force to retrieve ferromagnetic junk from the wellbore, protecting the drill bit and downhole tools from damage.