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Starrett C33H-12-4R 12-Inch Combination Square with Square Head Only They are also often used as try squares, center gauges, bevel protractors and rules. 12-inches in size, regular satin chrome blade and protractor head, 8ths, 16ths, quick-reading 32nds, 64ths graduations. With reversible lock bolts, spirit level in both square head and protractor head, direct-reading double 1800 [...]