This mini try square is only 4 inches long, but will do the job just like the bigger versions. You can measure and mark right angles in your construction work easily with this tool. It's small enough to fit in most tool boxes. The square may have +/- 2 degree right angle inaccuracy.* This carpenters square is 4 inches long, but will do the job just like the larger ones * Wood and metal construction - bolted together securely so that it will never shift position * For general carpentary use | +/- 2 degrees square inaccuracy may be present * Great for framing, panelling, flooring, door jambs, windows, and more * This compact size carpenter square is designed to fit easily in your toolbox