Quickly releases from a downhole string should the assembly below the safety joint become stuck
Enables the recovery of tools and down-hole gauges above the safety joint when the string is stuck
Allows the retrieval of the lower (stuck)portion by either fishing over the OD of the box section or by re-engaging the pin section into the box section
Prevents right-hand torque from acting on the shear pin
Easily disengages and reengages with a large, coarse thread design that carries the string load