Shinwa H-3412A 6" 150 mm Rigid English Metric Zero Glare Satin Chrome Stainless Steel E/M Machinist Engineer Ruler/Rule with Graduations in 1/64, 1/32, mm and .5 mm 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 , .5 mm 50th, 32nd and 64th 4R markings are precision photo etched and then black filled for easy readability Rule is .750" wide and .035" thick Conforms to Japanese Industrial Standard (JIS) B 7516 Grade 1