Product review (5 stars): Cheap, saved me $200
I seriously thought my ISE Badger 5 Plus disposal was destined for the dump.  It'd buzz loudly when turned on but wouldn't spin.  I tried using an allen wrench about the same size to un-jam the disposal and it felt hopelessly stuck.

Bought this wrench and gave the disposal one last shot. At first it also felt hopelessly stuck.  Then I had a little bit of play.  Kept pushing (quite hard) in both directions and eventually the disposal's blades were spinning, but it felt very rough.  Ran the disposal for a bit and it's totally free-spinning now.