Engineers' precision steel rules with imperial and metric graduations. The imperial side is graduated to 16ths, 32nds, 64ths, and 100ths. The metric scale is graduated to 0.5mm. These rules offer rust-resistant steel construction for a long life and Class I accuracy for precise measurement readings. Up to 600mm/24" feature an anti-glare, easy-to-read finish with permanent black figures and graduations. Constructed from standard rustless steel for improved durability. Specifications include a round end, rigid blade, 2 sides, and 4 edges. Metric graduations conform to BS 4372: 1968. Ideal for engineering workshops and industrial applications.