WM4 is essentially a square with a flexible corner opening for easy insertion of wires. Its beauty is its versatility. Secured with optional double-sided tape, stapled or screwed, the WM4 can be mounted vertically or suspended horizontally under the work surface. You can also install it flush with the work surface between the back edge and the panel, creating a lip or "stop" to keep objects from falling down behind. Serrated edges also provide protection from fingerprints and scratches.