Description:This protective ruler is anti-seepage, which can effectively avoid ink penetration and ink entrainment during marking operation.Anti-rust and corrosion resistant aluminum alloy ruler is wear resistant, which is durable for you to reuse in daily life.Made with aluminum alloy material, this product is anti-rust and wear resistant.There are three sizes for you to choose from.It is specially used for the positioning and marking of woodworking tenon and tenon joints, which is very suitable for drawing, woodworking, design and so on.Item Name: Measuring Straight RulerMaterial: Aluminum AlloyFeatures: Lightweight, Portable, Convenient Measuring Range: 20cm: 0-20cm, 30cm: 0-30cm, 45cm: 0-45cmSize Details: 20cm Size: 21cm x 3.5cm x 1.25cm/8.27" x 1.38" x 0.49" (Approx.)30cm Size: 31cm x 3.5cm x 1.25cm/12.2" x 1.38" x 0.49" (Approx.)45cm Size: 46cm x 3.5cm x 1.25cm/18.11" x 1.38" x 0.49" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Measuring Straight Ruler