18" Full-Flexible Steel Rules with Inch Graduations Cat. No. EDP Length Width x Thickness Graduations Feature Remarks C305R-18* 51349 18" 3/4 x 1/50" 5R – Quick-Reading 10ths,Aircraft Quick-Reading 100ths, 32nds and 64ths C316R-18* 51376 18" 3/4 x 1/50" 16R – Quick-Reading 32nds, 64ths,Aircraft Quick-Reading 50ths and 100ths 18" Spring-Tempered Steel Rules with Inch Graduations Cat. No. EDP Length Width x Thickness Graduations Feature Remarks C604R-18 52680 18" 1-1/8 x 3/64" 4R – 8ths, 16ths, Quick-Reading 32nds and 64ths C604R-18 W/SLC 66886 With Standard Letter of Certification† CH604R-18 52675 With Hook 24" Full-Flexible Steel Rules with Inch Graduations Cat. No. EDP Length Width x Thickness Graduations Feature Remarks C304R-24 56645 24" 3/4 x 1/50" 4R – 8ths, 16ths, Quick-Reading 32nds and 64ths C305R-24* 51350 24" 3/4 x 1/50" 5R – Quick-Reading 10ths,Aircraft Quick-Reading 100ths, 32nds and 64ths C316R-24* 51377 24" 3/4 x 1/50" 16R – Quick-Reading 32nds, 64ths,Aircraft Quick-Reading 50ths and 100ths 24" Semi-Flexible Steel Rules with Inch Graduations Cat. No. EDP Length Width x Thickness Graduations Feature Remarks C303SR-24 51338 24" 1" x 1/50" 3R – Quick-Reading 10ths, Aircraft Quick-Reading 50ths, 32nds and 64ths 24" Spring-Tempered Steel Rules with Inch Graduations Cat. No. EDP Length Width x Thickness Graduations Feature Remarks C604R-24 52681 24" 1-1/4 x 3/64" 4R – 8ths, 16ths, Quick-Reading 32nds and 64ths C604R-24 W/SLC 66887 With Standard Letter of Certification† CH604R-24 52676 With Hook C607R-24 52691 24" 1-1/4 x 3/64" 7R – 16ths, Quick-Reading 32nds, 64ths, Aircraft Quick-Reading 100ths 24" Heavy Spring-Tempered Steel Rules with Inch Graduations Cat. No. EDP Length Width x Thickness Graduations Feature Remarks C404R-24 51484 24" 1-1/4 x 1/10" 4R – 8ths, 16ths, Quick-Reading 32nds and 64ths CH404R-24 51494 With Hook C416R-24 51509 24" 1-1/4 x 1/10" 16R – Quick-Reading 32nds, 64ths,Aircraft Quick-Reading 50ths and 100ths CH416R-24 51519 With Hook All C404R and C416R Rules furnished with hole in end for hanging. † Includes redemption card for Standard Letter of Certification (SLC). * Indicates rules with single row of inch figures (all rules under 1" width).Rules without asterisk have double row of inch figures,and each edge represents the bottom edge reading left to right (rules 1" and wider). Steel Rules with Inch Gradua tions 1-144" All rules furnished with Starrett satin chrome finish, except where noted. Additional sizes and variations available by special order. Steel Rules 291 starrett.com P recision R ules , S traight E dges , P arallels