Size Parameter: The applicable ruler is about 20-30 mm/0.79-1.18 inches wide and about 2 mm/0.08 inches thick. From measuring 45 degrees, 90 degrees, depth, width to drawing lines, make the operation more precise.Wide Range of Applications: It is suitable compatible with all kinds of steel rulers, which are not easy to fall off. Adjustable pressure block, only need to move the ruler to the required scale and tighten the screws, which is convenient and efficient to use.High-quality Material: Aluminum alloy + brass material, multi-axis precision equipment processing, sandblasting and anodizing. Precise Specification. It is easy to draw a 45-degree 90-degree line.Adjust flexibly without hurting the ruler. Equipped with a about 300 mm/11.81 inches double scale steel ruler, easy to use.High Precision and Efficiency: Move to the required position and tighten the screws. Suitable compatible with all kinds of rulers, the ruler is not easy to fall off.Colour: silverMaterial: stainless steel + copperSize: 30cmPackage Contents:1 * RulerOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.