I think it is more than just a snatch block - It is used for angle pulls and when the choker chain that is attached to the main cable hits the pulley the cable drops or releases from hte pulley bringing the pull more in line with the winch for the remainder of the pull -
Farmi offers one for purchase as I am sure other mfg's do also
It saves a few steps in the process with the auto release
Farmi offers one for purchase as I am sure other mfg's do also
It saves a few steps in the process with the auto release