1.COMBINATION SQUARE: This multiuse measurement tool with an antilock; corrosionresistant stainless steel blade ensures the accuracy of a 90° angle; a 45° angle; the center of a circular item; finding depth; and easy distance measurements. 2.CAST ZINC HEAD: The cast zinc head of the combo square acts as a stop; ensuring layout lines are always square to the edges; making it an ideal machinist's square; straightedge; adjustable try square; miter square; marking gauge; and depth gauge. 3.EXCEPTIONAL PERFORMANCE: This carpentry square has a reinforced screwin scriber that does not fall out; hence; allowing the square to resist even the worst job site misuse. 4.DURABLE: This 16' metal square's acrylic vial and cast zinc head features chipresistant ecoating finish for longevity. Its stainless steel blade features permanent stamped English graduations of 1/8'; 1/16'; and 1/32' as well as metric graduations for faderesistance.