Woodpeckers 641/851 Squares Set includes both a 6-inch square and an 8-inch square, crafted from stable and durable aluminum plating. Designed with shoulders on the inside edge of the handle, these squares lay flat for accurate measurements on either edge of the blade. Their thick base allows the blade to stand upright, enabling hands- checking of casework parts for squareness. Each square features a notch on the inside corner for zeroing out layout lines to the edge of your workpiece. Laser-etched measurements in 1/16th increments are present on both sides of the blade, ensuring precision. These squares deliver measurements within .001-inch accuracy, making them reliable tools for woodworking and layout tasks. Model Number: 641851I