PEC Tools 6" 16R rigid black chrome, "high-contrast" machinist ruler with markings 1/50", 1/100", 1/32" and 1/64" This precision 6 16R rigid ruler is made in the USA by Products Engineering Company (PEC Tools), a premier tool manufacturer. Rule is made from spring tempered and hardened steel and is .750 wide by .036 thick. It has a high-contrast black chrome finish that provides better rust resistance than polished steel and can be easily read in both low and bright light conditions. The sides of each rule are ground parallel and each end is accurately ground square to allow reading from either end. 16R graduations have 1/50 and 1/100 on one side and quick-reading 1/32 and 1/64 on the other. Graduations are precision photo etched and then white filled for easy readability.