The GreatNeck 12" Combination Square is ideal for marking lumber before ripping & cross-cutting & features a heavy duty die cast zinc head. Features common 45° & 90° edges with stainless steel rule (accurate to within 1/32") & a brass scribe. The sturdy body of the combo square features solid brass hardware & a self-locking spring-loaded blade to ensure firm, accurate settings. Steel blades are treated to resist rust & are permanently impressed in eighths & sixteenths & thirty-seconds on the other. A good versatile combination square & a good tool for a wide variety of projects.