I bought an Excalibur table saw last year and this came with it. The saw was made in Taiwan and this thing also has a made in Taiwan sticker on it. It is made of aluminium and the large plastic knob adjusts its width. It has two magnifying tape measure markers, under which are what look like micro adjusters. The aluminium is the same dimensions as a mitre track, and it fits nicely over the fence. I’m baffled!