Shinwa H101-C 300 mm Rigid"Zero Glare" Metric Machinist Ruler/Rule Scale .5 mm & mm Markings Made from the finest stainless steel available and is hardened and tempered Has a zero glare satin chrome finish which makes it easy to read and will prevent corrosion. mm and .5mm markings are precision photo etched and then black filled for easy readability Rule is 25 mm wide and 1 mm thick Conforms to Japanese Industrial Standard (JIS) B 7516 Grade 1