Empire Level E250M 12-Inch Heavy Duty Professional Combination Square With Etched Stainless Steel Blade, Metric Graduations and True Blue Vial 12-inch heavy-duty professional combination square with an etched stainless steel blade, metric graduations and True Blue vial True Blue vial is guaranteed accurate to within .00050 inch for maximum accuracy, extreme durability, and enhanced readability Stainless steel blade has a matte finish that will never rust or corrode Self-aligning draw bolt, hardened scriber and heavy-duty machined square head Made in USA