Universal adapter kit - fits most low cost stands.
All mass market stands will include brackets to connect speakers to the poles. We call it the 'L Post' in these photos.
ORB stainless screws are 1/4 20 thread - the most commonly used size.
The bracket supplied with any stands you want to buy will very likely work fine with this kit. Check the stand owner's manual for their detailed parts breakdown. The hole sizes are usually easy to find.