The DAESSY 1″ Round Side Mount Clamp can be used on most chairs that have 1″ or 25mm round tubing (or smaller with sleeves) whether they be manual or power-base chairs.
The reason for the “side mount” is so it can sit underneath, or to the under-side, of the seat base frame work. This is required when the chair has a tilting seat system, which are very common too.