If you're into machining or workshop projects, this double square is a must-have. It's built to EEC Class 1 accuracy standards – meaning it's guaranteed to be square within 0.002 inches over the whole blade length. The blade is made from hardened, tempered stainless steel with a satin chrome finish that reduces glare. The markings are photo-etched and filled in black so you can read measurements easily, and they're in handy 4R graduations (1/64ths and 1/32nds on one side, 1/8ths and 1/16ths on the other). The head is cobalt blue, precision-machined, and locks tight with a knob so it won't slip during use. Comes in a cardboard box, ready for your shop. Great for setting up machinery, layout work, or any task where precision matters. Blade specs: 0.728\ wide, 0.078\ thick, with a clear groove for marking. Solid, reliable, and accurate – a workshop favorite.