This is a Hardened Stainless Steel Satin Chrome Rigid 12" 300 mm Steel English Metric rule. This rule is made in Japan by Shinwa Measuring Tools Corporation, a premier tool manufacturer and is one of the most commonly used rules in Japan. This rule is made from the finest stainless steel available and is hardened and tempered. It has a zero glare satin chrome finish which makes it easy to read and will prevent corrosion. Markings are precision photo etched and then black filled for easy readability. The English Metric graduations shows 32nds and 64ths on one side and mm and .5 mm on the reverse. Rule is 1.250" wide and .040" thick. Both long edges and ends are ground flat and straight. Accuracy conforms to Japanese Industrial Standard (JIS) B 7516 Grade 1.