The releasing overshot is the special external fishing tool used for fishing drill collar, drill pipe, oil tube and other fishes in drilling and work over operation.

The releasable reversing overshot, a new type of fishing tool, has many advantages owned by various overshot, box tap and the like. Its distinguishing features are as follows. 
To unscrew and recover the stuck fish, to release the fish down hole if necessary, to circulate the washing fluid.

In drilling and work over operation, the releasing slip spear is a tool mainly used for fishing of drill pipe, oil pipe and casing from fish hole. It can be used with internal cutter, bumper jar etc.

The CLF type fishing magnet in petroleum and geology exploration is used for fishing of small fallen objects in the down hole. With some of advantages such as simply structure, easy to operate, reliable performance, small size and light weight, it is equipped with permanent magnet iron that can attract small objects such as teeth wheel, palm, tong teeth and tool so that small objects in down hole are fished and the well bottom is cleaned up.

During drilling process, the drilling fishing cup is applied mainly for fishing of shivers and fallen objects such as carbide tooth, drill bit and bearing that can not be carried out of hole by convertional fluid circulation, etc. it possesses important functions to keep hole toe cleaning, increase bit service lift, reduce and prevent drill bit from unexpected damage. The tools are available with all sizes and super performance.

The reverse circulation junk basket is used to retrieve all types of small junk objects such as cone, cutter, hand tool and junks from the bottom hole. During drilling operation, it produces a local reverse circulation of fluid at well core so as to effect a complete recovery of junk in the junk basket. Especially when PDC bit is used, cleaning bottom well by the tool becomes very necessary to ensure the bit with a normal application. The reverse circulation junk basket therefore becomes an essential tool in oil, geology exploration and drilling engineering.

The cone fisher is a special tool for fishing of objects such as drill bit cone dropped in hole during drilling or work over operation. With strong grinding force, it is suitable for the fishing and coring in hard formation.

The multi-functional fisher integrating the functions of fishing cup, fishing magnet and claw fishing basket into an organic whole is used for fishing of fragments and objects in downhole. With advantages of simple structure, safe and reliable performance, high fishing efficiency, it is one of the best desired tools in cleaning of well bottom at present.