These things are referred to by a few different names such as dutchmen, dovetail keys, butterflies, and bow ties. What they do is prevent a crack in a piece of wood from growing due to their double wedge shape. The installation process is really easy and this is a great introduction to inlay work. In this project, I am making all my butterflies unique so I am cutting and shaping them all individually.
I wanted aluminum ramps so they’d be lightweight and I bought some vs making them myself because after building this trailer, I just wanted to