a square having a metal ruler set at right angles to another straight piece
link A square with a steel tongue in a wooden handle. Tool Use and Safety Air Compressors Band Saws Circular Saws Drill Presses Hand Drills Jointers Miter Saws Radial Arm Saws Routers Sanders Scroll Saws Shapers Table Saws Thickness Planers Wood Lathes General Information About Joints About Nails Screws & Screwdrivers Making Inside Cuts Drawing Large Curves Electric Motors Finishing Laying Out An Elipse Lumber Dimensions Keeping It Square Making Shelves A to G ---- H to M
A metal blade set at a right angle to a metal or wooden block. Used for accurately checking and marking 90 degree angles.