Steel Rules C623R-6 Steel Rule with Letter and Number Drill Sizes 6" This practical shop rule has accurate, photo-engraved graduations in 32nds and 64ths with Quick-Reading figures on one side. The reverse side has letter sizes of drills from A to Z with corresponding diameters in thousandths and also number sizes from 1 to 80 with diameters in thousandths. Made of fine spring-tempered steel with no-glare satin chrome finish. C622R-6 Steel Rule with Decimal Equiv alents 6" One side of this handy rule has accurate, photo-engraved, distinctive graduations in both Quick-Reading 32nds and 64ths.The reverse side has a legible table of fractions and decimal equivalents. Made of finest spring-tempered steel with no-glare satin chrome finish. 6" Steel Rule with Decimal Equivalents Cat. No. EDP Width x Thickness Graduation C622R-6 56660 3/4 x 3/64" 10R – Quick-Reading 32nds and 64ths One Side and Decimal Equivalents on Reverse Side 6" Steel Rule with Letter and Number Drill Sizes Cat. No. EDP Width x Thickness Graduation C623R-6 56661 3/4 x 3/64" 10R – Quick-Reading 32nds and 64ths One Side and Letter and Number Drill Sizes on Reverse Side C622R-6 C623R-6 298 P recision R ules , S traight E dges , P arallels