A complete substitute for a whole set of common solid try squares, a 45 degree mitre, a depth gauge, a height gauge, a marking or scribing gauge, a level, a plumb and by withdrawing the blade, it can also be used as a precision rule. The Starrett 435 Series Combination Squares are the very best sets available, with reversible lock bolts, scriber, spirit level in both square head and protractor head, direct reading double 180° protractor scale, and a hardened steel, machine-divided blade. Forged and hardened heads and centre heads, cast iron protractor head with smooth, black enamel finish.