The black wrench part of the tool swivels on the silver bar to any angle you may need. Grasp the tool where the 2 black jaw meet (on the silver button) and work it back and forth sometimes the tool is very tight and a shot of WD-40 or other spray lubrican
Basin wrench
Spring loaded jaws and infinitely adjustable head angle design accommodates up to 1" hex and square nuts in tight places