Features: Crafted from aluminum alloy, this multifunctional ruler combines durability with protective edges, suitable for precisely measurement and engineering drafting. Features scratch resistant designs, light weight construction, rustproof and break resistance for long time durability. Suitable for students, and engineers seeks multipurpose drawing tool for academic project, technical drawings, or professional engineering drawing. Effortlessly adapts to classroom, home studios, or construction sites, while delivering accurately measuring result in educational or industrial setting. Engineered with smoothly edges and matte black finish, this aluminum alloy ruler elevates functionality while maintaining professional aesthetic for daily tasks. Specifications: Component: Aluminum alloy Color: Black Type: 20cm Ruler, 30cm Ruler, 45cm Ruler Size1: Approx. 20cm/7.87in Size2: Approx. 30cm/11.81in Size3: Approx. 45.0cm/17.72in Weight: Approx. 53g, 83g, 111g Package Includes: 1Piece Aluminum Alloy 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