Woodpeckers 851 8-In. Precision Square w/ Case is crafted from stable, durable aluminum plating, designed with shoulders on the inside edge of the handle to lay flat for precise measurements on either edge of the blade. It features a thick base that allows the blade to stand upright, enabling hands- checking of casework parts for square accuracy. This precision square includes 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 clear and accurate readings. With an impressive accuracy within .001 inches, this tool is i for fine woodworking and detailed projects. Model Number: 851I