Cast-Iron Bodies 50A has an adjustable point for increased precision. Through hardened steel divider points. Reversible lock bolt allows choice of which graduated side of the blade faces the operator Protractor heads are made of stable cast iron and finished with a choice of attractive black wrinkle finish or smooth black finish Tempered steel blades with accurate, machine-divided graduations A spirit level indicates when the base reference surface is level – a feature not usually available on comparable protractors The heads are die cast with black wrinkle finish and have hardened, forged steel divider points The points screw into the heads Has an adjustable point