A jack for gluing or re-gluing braces. One side is for tapered brace ends. The other is for tapered braces. I have a 2 inch (50mm) and a sllightly smaller 46 mm version. Just in case you need a bunch of cheap brace jacks! Be sure to remove support from brace slot! If any dimension turns out to not work for you, send me a message so I can fix it.