A very nice little 45/90 degree ruler. I needed a small tool to set the height on my table saw and also the height on my router table. I hate it when tools are not accurate, even a small mistake drives me crazy. This part is perfect. I tested both corners on my Bridge City and Woodpeckers squares and this little square is perfect. Very pretty, love how thick it is so it can stand on its own. I'm glad I bought it.