This model is used to hold an extension cord and is fastened to angle iron. It is designed to keep the edge of the angle iron from cutting into the insulation. The cord can easily be lifted and removed.
The angle iron is not necessarily symmetrical and is the reason there are two models. One has a chamfer and one has a fillet on the edge to denote the difference between the two. The Fusion 360 model has been provided to modify if your angle iron has different dimensions.
The author marked this model as their own original creation.