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.Agoodversatile combination square & a good tool for a wide variety of projects.