30cm 12" Professional Metric Plastic Triangular Scale Ruler 1:20 1:25 1:50 1:100 1:125 1:150 / 1:200 1:500 1:1000 1:1250 1:1500 1:2500 in a box 30cm 12" Professional Metric Plastic Triangular Scale Ruler 1:20 1:25 1:50 1:100 1:125 1:150 / 1:200 1:500 1:1000 1:1250 1:1500 1:2500 Length: 12", 30cm. Supplied in a rigid transparent box for easy storage and protection. Made of white with red green and white color stripes. 2 scales on each side of the ruler (12 different scales in total) - covers most of the scales used on architectural and engineering drawings . High quality ruler for professional applications, architecture, engineering, technical drawing.