Professional set square for commercial or occasional use 4” engineers set square Suitable for a number of uses including carpenters / builders / roofers / remodelling etc... Stainless steel set square for maximum strength and durability Perfect for laying out precise 90 degree angles, checking internal angles, marking stock or using as a guide Total dimensions 100mm (depth) x 60mm (width) Solid construction for accurate results each time Can also be used as a ruler if required