Features: Achieve precisely measurements with this aluminum ruler, featuring smudgeproof coating to prevent inks bleeding and ensures clean line for accurately drafting and design work. Crafted from aluminum alloy, it boasts rounded edges for safety, anti slip base for stability, and light weight construction to resist bending during intensive use. Ideal for students, architects, engineers, and anyone who demand professional drawing ruler measuring tool for detailed project requiring exact dimensions and secure handling. Perfect for engineering drawings, architectural plans, sewing pattern, or any setting where smooth surfaces demand anti slip ruler to maintain position during precisely cutting or marking. Light weight and portable, this ruler offer long term durability for professional on the go and without the risk of slips or injuries. Specifications: Component: Aluminum Alloy Color: Silver Size1: Approx. 20cm/7.87in Size2: Approx. 30cm/11.81in Size3: Approx. 45cm/17.71in Weight: Approx. 50g, 70g, 100g 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