The Select Non-Rotating Safety Shear Sub was developed for use with stationary downhole equipment that develops
rotational torque. The shear sub is installed in the tool string between the coiled tubing and the downhole tool. An example
would be an ESP (electric submersible pump), run on small diameter coil, or polyethylene tubing, which upon startup, if allowed to rotate, would cause twisting and subsequent failure of the power cable.