Triangular Ruler with Grid Markings, 30cm, for Drafting, Architecture, and Design UCHIDA Grid Triangular Ruler, 30cm, 2mm Thick, 5mm Grid This is a 30cm ruler, so the long side of the right triangle is 30cm. It has been used, so there may be some minor scratches, but the markings are not faded. The corners are also not bent. Please consider purchasing this item understanding that it is a used product.