Material - ruler is made of stainless steel, wear resistance and corrosion resistance, and high hardness. The adjustable positioning block is made of copper material with a smooth surface and is not easy to rust. Feature - The locating block and the stainless steel ruler are used together to make positioning and marking more convenient, just move the scale to the desired scale and lock the screw. Application - The steel ruler is suitable for carpenters, engineers, and architects, convenient for drawing, length and width measurement, scribe marking, crafting measurement and more. Package Content - 1 x Metal Ruler, 1 x Scriber Block. Double-scale metal ruler with smooth without burrs, clear numbers, and accurate scale, easy to read, suitable for both amateurs and professionals. Colour:Silver Material:Stainless steel Size:400mm ruler/300mm ruler/150mm ruler/200mm ruler Package Contents: 1 * 400mm ruler 1 * 30mm locating block / 1 * 300mm ruler 1 * 26mm locating block / 1 * 150mm ruler 1 * 20mm locating block / 1 * 200mm ruler 1 * 26mm locating block Only the above package content, other products are not included. Note: Light reflection 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.