With reversible lock bolts, scriber, spirit level in both square head and protractor head, direct reading double 180° protractor scale, hardened steel, machine-divided blade 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.