STAEDTLER Triangle Ruler Set for Drafting and Layout, 30cm, 966 30

30cm 45° and 60° pair, with 5mm grid, 1mm dotted line markings, and protractor markings, mirror finish A standard grid-marked triangular ruler for drafting and writing instruments. Made of thick resin with minimal distortion. The gray scale print prevents confusion with lines on drawings and provides excellent visibility even on dark-colored paper.