Economill is a kind of tool for grinding the falling objects. Such as grinding bit, cone, drift, slip teeth, washpipe, sub, deep well pump accessories, and other falling objects. As the structure is shown in the figure, it is composed of body and carbon tungsten alloy. The body is composed of two sections of cylinder, the upper part of the small cylinder is a connection thread, the connection thread can be made into pin thread or box thread according to user's requirement. The bottom and side of the large cylinder have a water groove, the bottom of the water groove is opened with a mud circulation hole, YD alloy or other wear-resistant materials between the water groove.
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