The UltraTest Combination Measuring Set brings you the power of a square, ruler, protractor and centering gage in one convenient design. The three measuring heads attach to the 12 in. satin chrome blade for taking a variety of measurements with ease. The Square Head provides 45 and 90 degree angles and also features a level and hardened scriber. The reversible Protractor Head measures odd angles with precision accuracy, and the Centering Head allows you to find the middle of round stock. Four piece measuring set for limitless applications. 12 in. high carbon steel rule with etched graduations and satin chrome finish. Square Head for 45 and 90 degree angles. Reversible Protractor Head with double shoulder for odd angles. Center Head for use with round stock. Spirit level and hardened scriber included with Square Head. Graduations in 1/8, 1/16, 1/32 and 1/64 in. Meets government specification GGG-S-656C.