A belay plate that can be used in many different conditions. 
It is a very useful device for rescue operations, the natural choice for mountain experts.
It allows a cleaner belay point, avoiding tricky and cumbersome chains of carabiners and plates.
The wide upper hole is able to accommodate two connectors for higher safety.
When used as a descending device, it works with ropes from 8 to 12mm.
 
Tested piece by piece.