This precision 1000 mm metric rigid ruler is made by Shinwa Measuring Corporation, a premier tool manufacturer. Rule is made from spring tempered and hardened stainless steel and is 1.375” wide by .060” thick. It has a “zero-glare” satin chrome finish on the face that can be easily read in both low and bright light conditions. One face has metric graduations in both .5mm and mm and the reverse side has metric conversion tables and tap drill sizes. Graduations are precision photo etched and then black filled for easy readability. 100 mm divisions are marked in red. The sides of each rule are precision ground parallel to each other. One end is accurately ground square to allow accurate reading, while the other end is rounded with a hole for hanging.