There are 2 protruding indentations on the handle, one on top and one on the bottom. If you are working with a smaller object, the square will not be correct unless both indentations are adjacent to the workpiece. If you sanded them down, the square would work fine, but the scale would be off by about 1/16th, so. A simple tool that I love to use all the time, but this one just isn't for me. Update 10/30/2013 I really don't like this tool. I have been using this square style for construction for