Empire Level E255M 6-Inch Pocket Combination Square With Stainless Steel Blade, Metric Graduations and True Blue Vial Precision machined square head and True Blue vials ensure sureness to .001 6-inch etched stainless steel blade with metric graduations Self aligning draw bolt and hardened scriber True Blue vial is guaranteed accurate to within .00050 inch for maximum accuracy, extreme durability and enhanced readability Made in USA