This is a Hardened Stainless Steel Satin Chrome Rigid 150 mm. This rule is made manufactured by Shinwa Measuring Tools Corporation, a premier tool manufacturer. 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 metric graduations show mm and .5 mm on one side and metric conversions on the reverse. side. Rule is 15 mm wide .5 mm thick. Both long edges and one end ends are ground flat and straight. Other end is rounded with a handing hole. Accuracy conforms to Japanese Industrial Standard (JIS) B 7516 Grade 1.