Stanley 1-35-333 (60R) 600mm Line of Chords Rule

Made from hardened steel, polished and ground finish, precision etched for accurate measurement. Can be used to measure diameters up to 600mm (24") and the equivalent circumference can be read directly from the rule, totally eliminating the need for calculating the circumference. The line of chords scale on the rule, when used in conjunction with dividers allows angles to be set or measured.