Non-magnetic sub is made by stainless steel. It provide non-magnetic environment for LMD and MWD in directional drilling. The length depends on the location and the orientation and pitch of the directional well. It also can be designed according to user’s requirement. We can supply the subs such as: ?95,?105,?120,?165,?172,?203. In addition, we can provide the high pressure rotary circulating head used for drill pipe log as during directional drilling and various subs for drilling, testing and repairing.