These are extremely versatile, high quality clamps that can be used to fit all sorts of equipment to standard hardware in photography, live events and other productions. Buying this package not only gets 2 for a good price but includes the adapter to link them at 1 of 8 angles, great for attaching equipment in all sorts of combinations. I use a pair to attach a microphone boom to a lighting bar above a drummer, so I can have the drums overheads mics in the best position without having more cables and stands on an already crowded stage, and leaving less to trip over and less risk of knocking out of position. With a pair of these you can attach any equipment to almost any mounting, it's ideal
I just wish the handles could ratchet, so you can have them at a different angle to tighten the clamps. It can also be tricky to access some of the controls when clamped but this is minor and there are ways around it