Easy to use: The brass positioning block can be placed in the desired position, then simply tighten the screws, easy to use. Can be used on all types of steel ruler. With the steel ruler, all measuring work can be carried out with a high degree of accuracy within a measuring range of 0 - 30 cm. Double scale: The woodworking marking tool is marked with 2 different scales, centimeters on the front and inches on the back, which can meet different measurement standards. Material: Office ruler is made of durable inflexible stainless steel but a little flexible, good for long lasting use; The markings are a bit embedded in the metal, so they won't rub off over time. Perfect combination: Positioning block Parallel ruler for woodworking Scale, marking gauge with a ruler made of stainless steel, stop made of brass. Measurable time savings through convenient transfer of measurements. at the highest level of precision. Note: The data are all measured manually. Please allow an error of 1-3cm. Due to the difference between light and display, there is a certain color difference, which depends on the actual object received.