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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: 100mm (4in) External size: 120 x 75mmInternal size: 100 x 56mmStock thickness: 8.5mmBlade thickness: 1.7mmAdditional Information:• Length (mm): 100• Length (in): 4