The product is made of advanced non-magnetic material, which is mainly used to install the matching drilling tools for monitoring whether the borehole is drilled according to the designed trajectory. It is a special tool for detecting the azimuth angle of the borehole and accurately measuring. The non-magnetic drill collars produced by our company are made of self-developed low carbon stainless steel. They are in accordance with API specification and SY / t5144 standard. They can be cold rolled for threads, and can be used to process double shoulder threads and other special threads.