Empire Level E280M 16-Inch Heavy Duty Professional Combination Square With Etched Stainless Steel Blade, Metric Graduations and True Blue Vial Precision machined head and True Blue vials ensure sureness to .001 16-inch etched stainless steel blade with metric graduations Heavy duty machined square heard, self aligned draw bolt and harnded scriber True Blue vial is guaranteed accurate to within .00050 inch for maximum accuracy, extreme durability and enhanced readability Made in USA