Features: 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. 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 preventing scratches or deformation. Suitable for architects, engineers, teacher, students, scrapbooking and journal enthusiasts, and anyone who requiring precisely geometry measuring tool in technical drawing, school project. Widely used for drafting blueprints, measuring fabric, architectural drafting, math drawing, assembling models, woodworking, or academic geometry tasks in classroom, office, construction drafting. The integrated hanging hole enable easy portability in toolkits or backpacks, while multiple size ( from 15.0cm to 150cm) adapt to diverse spatial and geometric measurement needs. Specifications: Color: Silver Component: Stainless Steel Type: 15.0cm; 20cm; 30cm; 40cm; 50cm; 60cm; 100cm; 150cm; Size: Assorted Size As Picture Shown. Weight: Approx. 17g-630g Package Includes: 1Piece Stainless Steel Ruler note: 1.Please allow 0-1cm error due to manual measurement. Be sure you donot mind before bid. 2.Due to difference between different monitors, the picture may not reflect the actual color