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ALL IN ONE DESIGN: Integrated 18cm straight ruler, 30/60° triangle, 45/90° triangle and 180° protractor to meet multiple measuring needs CLEAR TRANSPARENT MATERIAL: See-through plastic with sharp printed scales for precise reading and easy alignment on paper SMOOTH SAFE EDGES: Polished smooth edges avoid paper scratches and hand cuts for comfortable daily drawing PORTABLE LIGHTWEIGHT BUILD: Compact size fits easily into pencil cases, great for school, office and hand drafting use MULTIPURPOSE GEOMETRY TOOL: Ideal for math geometry homework, technical drafting, sketching and student drawing tasks