The Faithfull Engineers Square has been carefully crafted from high quality tool steel, these squares are accurate to BS939 Grade B standard. The stock and blade are precision ground to ensure straightness and accuracy, and the spring steel blade is hardened and tempered for increased durability. Size: 50mm (2in) External size: 70 x 50mm Internal size: 50 x 31mm Stock thickness: 8.5mm Blade thickness: 1.7mm FAIES2