Sometimes you need a layout tool that sits on your work better than a simple square. That's where a saddle comes in handy - like these, made in Japan of tough extrusions with precision miters. One has two 45° ends; the other has a 45 and a 90° end. They measure about 3" x 7" long, and will never flop over the way many squares do.Note:
The metric markings on the edge are specific to particular Japanese methods of work, and do not affect the utility of the angles for marking-out (which is the main use of this tool).