These folding brackets lock in place when lifted, and can be used for reclining chairs or folding tables. Lift again, and they release to fold down.
The smaller 175mm (6.9") wide bracket has six stop positions, while the larger 245mm (9.6") wide has eight. The range of motion depends on how close they are to the pivot point, but the maximum operating arc on the small bracket is 95° from horizontal; the large has a maximum of 112°. Both will fold closed to a thickness of just over 2".
Size given is the length from the pivot to the pin holding the swivel plates on each arm.