Heavy duty 6" Aluminium Alloy Square. This tool features a handy 6" ruler with clear markings for quick measuring and scribing. It can be used as an accurate saw guide, protractor, and tri-square, with 90° and 45° mitre square capabilities. The easy-to-read scale allows you to find any angle from 0-180 degrees. Please note, instructions are not included, so ensure you know how to use this tool before purchasing. The product is marked as 6" but has markings up to 7".