Advantages:It is designed for precision layout and measurement work. The base is thick, upright and stable, and it does not tilt, making measurement easier and more convenient. The length of the blade is measured from the edge of the corner of the beam to the end of the blade. Item Name: 90 Degree Angle RulerMaterial: Carbon SteelMeasuring Angle: 90 DegreeMeasuring Accuracy: First LevelAdvantages: Durable, 90 Degree, Measuring Tool80mm Size: 8cm x 5cm x 0. 9cm/3. 15 x 1. 97 x 0. 35 (Approx. )100mm Size: 10cm x 6. 3cm x 1. 2cm/3. 94 x 2. 48 x 0. 47 (Approx. )125mm Size: 12. 5cm x 8cm x 1. 5cm/4. 92 x 3. 15 x 0. 59 (Approx. )Notes:Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes:1 x 90 Degree Angle Ruler