The 300mm Combination Set includes a reversible lock bolt, scriber, spirit level in both square head and protractor head, direct reading double 180° protractor scale, hardened steel, photo-engraved blade. The square heads and center heads are forged, hardened steel with smooth, black enamel finish. 300mm, mm and 1/2mm Both Sides, Satin Chrome Blade. FEATURES: Also available with satin chrome blade and protractor head. With reversible lock bolts, scriber, spirit level in both square head and protractor head. Direct reading double 180 Deg protractor scale. Hardened steel, machine divided blade. Satin Chrome Finish Blade. Forged and Hardened Steel Heads with Smooth Black Enamel Finish.