Profile: Henan Shenlong Petroleum Drilling Tools Inc. produces petroleum drilling tools. Our main products include slick drill collars, spiral drill collars, non-magnetic drill collars, heavy weight drill pipes and stabilizers. We are accredited with ISO 9001 certification. We work with horizontal lathes for machinery work & pipe thread lathes for making thread and heat-treatment lines. Our drill collars are made from 4145H modified steel. Our non-magnetic drill collars are made from chrome manganese and low carbon, obtained by combining a proprietary chemical analysis & a rotary hammer process.