These brackets are precision machined to mount to Fatar TP6/TP60 manuals and are used to attach the piston rail to the keyboard frame. Simply bend the the narrow end of the tab with a pair of pliers, to the depth your setup requires, and either put a small wood screw through it into the back of the piston rail, or even glue it.
These brackets are strong and reliable, yet remarkably easy to work with.
Sold in packs of 5. Each piston rail usually requires 3-4 for proper strength and rigidity.