The 300mm Combination Set with Square, Center and Reversible Protractor Head and Blade features 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. FEATURES: Reversible lock bolts, scriber, spirit level in both square head and protractor head. Direct reading double 180° protractor scale. Hardened steel, machine divided blade. Regular Finish Blade. Cast Iron Heads with Black Wrinkle Finish.