490, 491 Reversible Bevel Protractors 0-180º 12 Non-reversible Bevel Protractors 0-180º C490-12-4R reversible bevel protractor with black wrinkle finish C12-12-4R non-reversible bevel protractor with smooth finish Close-up of spirit level on back side of protractor Bevel Protractors Bevel Protractors Reversible Non-reversible Size Blade Finish Graduation Black Wrinkle Finish Black Smooth Finish Black Wrinkle Finish Cat. No. EDP Cat. No. EDP Cat. No. EDP C491-12-4R 64602 C490-12-4R 52514 C12-12-4R 64290 12" Satin Chrome 4R: 8ths, 16ths, Quick Reading, 32nds, 64ths C12-12-4R W/SLC* 66931 491-12-4R 52521 490-12-4R 52511 12-12-4R 50103 12" Regular 4R: 8ths, 16ths, Quick Reading, 32nds, 64ths 491-18-4R 52522 490-18-4R 52512 12-18-4R 50104 18" Regular 4R: 8ths, 16ths, Quick Reading, 32nds, 64ths 491-24-4R 52523 490-24-4R 52513 12-24-4R 50105 24" Regular 4R: 8ths, 16ths, Quick Reading, 32nds, 64ths 491ME-300 52524 12ME-300 50106 300mm and 11-3/4" Regular 1/2mm and 32nds one side; mm and 64ths, reverse side Since the protractor heads and blades are furnished with combination square sets, individual protractor heads or blades can be ordered separately. See the Squares section for information and catalog numbers. * Includes redemption card for Standard Letter of Certification (SLC). Readability Fea tures • Starrett satin chrome blades and protractor heads for easier reading are available (on 12" sizes) • Direct reading 0-180º in opposite directions, permitting the direct reading of angles and supplementary angles Ease-of-Handling Fea tures • Reversible lock bolt allows choice of which graduated side of the blade faces the operator • The 12 is non-reversible, meaning the blade is on the outside of the frame, so the frame stays on the same side of the workpiece • The 490 and 491 are reversible, meaning there is a shoulder on both sides of the blade, allowing the tool to be reversed so the same angle can be scribed or measured left and right Long-Life and Accuracy Fea tures • Protractor heads are made of stable cast iron and finished with a choice of attractive black wrinkle finish or smooth black finish • Tempered steel blades with accurate, photo-engraved graduations • A spirit level indicates when the base reference surface is level – a feature not usually available on comparable protractors 310 P rotractors and A ngle M easurement