Torque reduction sub is mainly connected between short radius horizontal section and large angle well section, propose to connect a torque reduction sub by every 60ft, it can reduce 25%-35% torque after using this tool, it's slip spiral inner sleeve, straight rib outer sleeve and body mandrel are relatively in non-rotating condition. Features & Benefits: Reduce drill string wear and fatigue; Minimizes torque and drag; Minimizes casing wear; Increase ROP; Dampens vibration; Enhances drilling efficiency.