Made for a standard 40mm size thermoelectric peltier cooler. It was made to hold the peltier in place, and apply enough pressure to make good contact. You can also adjust the pressure by the screws as needed.
This was printed in PLA, which acts as a decent insulator, so it wont steal the cold away from the peltier.
The ends have a "star" shape holes, so you can use any screw that will fit, and it is adjustable by how it attaches to the heat sink, There are also slots on the bottom, to let the wires on the peltier escape its enclosure.