PEC Tools USA 12" Rigid Stainless Steel 4R Machinist ruler/rule 1/64, 1/32, 1/8 1/16 This rule is made in the USA by Products Engineering Company (PEC Tools), a premier US tool manufacturer. 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. The 4R graduation shows 32nds and 64ths on one side and 8ths and 16ths on the reverse. Rule is 1.00 wide and .035 thick. Both long edges are ground flat and straight.