General Tools CF667ME Ultra Test Rigid Steel Rule General Tools and Instruments CF667ME Ultra Test Rigid Steel Rule, 6 In., 3/4 In. Wide, 1/32-1/64-mm and .5 mm is a ruler is for machinists The markings are ultra fine black for easier reading and deciphering The rule is 6 inches long, and has a width of 3/4 inches The graduations of measure are 1/32, 1/64 inch and .5 millimeters Features a plastic sleeve for added corrosion protection, and a hard satin chrome finish General Tools and Instruments CF667ME Ultra Test Rigid Steel Rule, 6 In., 3/4 In. Wide, 1/32-1/64-mm and .5 mm is a ruler is for machinists The markings are ultra fine black for easier reading and deciphering The rule is 6 Inch long and has a width of 3/4 Inch The graduations of measure are 1/32, 1/64 inch and .5 millimeters Features a plastic sleeve for added corrosion protection and a hard satin chrome finish