A 300mm sturdy triangular aluminium rule with separate metric graduations on every side. * For technical designs where different scales are used * Ideal for engineers, technical students and architects * Recess down the centre to protect fingers when used for cutting work * Graduations on six sides: 1:20, 1:25, 1:50, 1:75, 1:100 and 1:125 * Rolson type 50820 https://elecena.pl/product/27204352/rolson-50820-300mm-triangle-scale-ruler 2024-11-09 https://elecena.pl/product/27204352/rolson-50820-300mm-triangle-scale-ruler 2025-05-18