Cosmetic marks (See images) Notice that Woodpeckers Clamping Squares PLUS work either inside or outside the workpieces. Take a look at the inside corner, too. You’ll see a relief cut that won’t bind on your stock if something is cut just a wee bit out of square. Speaking of square, these assembly tools are CNC machined out of one solid chunk of aluminium to a tolerance of ± .0255 degrees! The square legs are 1-1/4” wide, 6-3/4” long, and 3/4” thick.
eBay