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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: 225mm (9in) External size: 262 x 160mmInternal size: 235 x 129mmStock thickness: 18mmBlade thickness: 2mmAdditional Information:• Length (mm): 225• Length (in): 9