Steel scriber. Reversible lock bolt allows blade to be turned over or end-for-end, without removing the lock bolt or nut. Spirit level in square and protractor heads. Square head with black wrinkle finish. Center head accurately finds center of round work. Multi-purpose uses include. 45° miter, depth gage, height gage, marking or scribing gage, a level, a plumb, and a precision rule. Hardened, machine divided graduations, blade. Protractor head has direct reading, double 180° scale.