A great value Helix transparent folding ruler with plastic finish. The ruler features a snap fit hinge, enabling you to fold it away for easy storage in your pencil case. With a cm/mm scale, the Helix folding ruler is ideal for students, school children and general office use. Product Information: • Plastic Folding Ruler • Transparent • Snap hinge • Folds in half • Measures: 30cm / 300mm