The integrated hanging hole enable easy portability in toolkits or backpacks, while multiple size ( from 15.0cm to 150cm) adapt to geometric measurement needs Featuring 0.5mm increment lines, smooth rounded edges, and rustproof and break resistant steel body, the math measuring ruler geometry drafting ruler maintains clearly centimeter and inch scale under frequent use while scratches or deformation Widely used for drafting blueprints, measuring fabric, architectural drafting, math drawing, assembling models, woodworking, or academic geometry tasks in classroom,, construction drafting Suitable for architects, engineers, teacher, students, scrapbooking and journal enthusiasts, and anyone who requiring precisely geometry measuring tool in technical drawing, school project Crafted from stainless steel with clearly centimeter and inch markings, this double side scale measuring ruler ensures long time durabilty, accuracy and resistance to wear for professional measuring and drawing result, Manufacturer: Obotsnoi