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.   

With Reversible lock bolts, scriber, spirit level in both square head and protractor head, direct reading double 180 degree protractor scale, and hardened steel, machine-divided blade. Forged and hardened heads and centre heads, cast iron protractor head with smooth, black enamel finish.