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The 4 Piece, 18 Combination Square Set from Spi is an essential tool for anyone in need of precise measurements for their projects. With a hardened steel blade and four graduations (0.01in; 0.02in; 0.03in, and 0.1mm), this set ensures accurate measurements down to the smallest detail. The cast iron center square allows you to quickly transfer measurements from your workpiece, while the built-in protractor makes it easy to take angles. Additionally, the compact design of the combination square makes it easy to take measurements in tight spaces or on uneven surfaces. Whether you're a professional contractor, DIY enthusiast, or student, this combination square set from Spi is the perfect tool for your next project.