I have seen this square in a woodworkers blog. It has a bodu about 1/2 x 3/4x3" and a very fine blade, about 1/8x.50x3 and two screws in rhw body apparently to adjust the blade. I searched McMaster Carr, but could not find it. Does any one know what the correct name for this square is and/or where to find one? I can email a photo of the square. Let me know at rar231@yahoo.com. Thanks, Roy Rice