Starrett's black-filled graduation lines are so uniform that each 1/64" line stands out clearly between its neighbors. The rule is graduated in English measure on both sides; the first side with 64ths on one edge and 32nds on the other, the second side with 16ths and 8ths. The 12" rule is 1" wide, it is constructed of 3/64" thick, slightly flexible spring-tempered steel with a multi-plate satin chrome finish.