PEC Tools USA 6" Flexible Stainless 5R Machinist Engineer ruler / rule 1/64, 1/32, 1/10, 1/100 This rule is made in the USA by Products Engineering Company (PEC Tools), a premier US tool manufact It is made from the finest stainless steel available and is hardened and tempered It has a brushed finish and is precision photo etched and then black filled for easy readability. 5R markings with 1/10", 1/100" and quick-reading 1/32" and 1/64" 6" flexible rule is .500" wide and .020" thick. .Both long edges are ground flat and straight.