Needed a wide miter box that could do 165mm and specific for back beveling. Most miter boxes have the center cut and 45 vertically, not many have horizontal so I made my own. I added a fence end on both sides so you don't have to line up anything, just slide it against the fence, and it bevels to the face (assuming face down) and you can slide to the other side to quickly bevel the other as well. 

It was made as a specific niche tool, but I figured I'd share it.