Very useful for lower bell bolts and turbine flanges. However, there should definitely be a retaining pin for the socket on the swivel. The ball retainer is too weak and the bushings can fly out immediately if you slip off the breech. A pin lock would be much more secure. The joint itself feels a bit sloppy/dirty/medium quality, time will tell how long it lasts, but it works if you need it for awkward jobs.