Product List: 1 Right Angle Positioning Block, size 4.9cmx5.0cmx0.9cmCarbon Steel Material: Woodworkings Positioning Block is made of carbon steel, which is both light and strong, suitable for long term useDIY Woodworkings Scriber Positioning Block: Ruler Scribing Positioning Block is used as a positioning block for DIY woodworkings scribers, which improves the accuracy of woodworkings operations and helps you draw easilyEssential Tool: Ruler Scribing Positioning Block is a multi functional tool for architects and carpenters, simplifying the measurement and marking process, easy to store and carryEasy to Use: Scribing Ruler Stop Tool is designed to be simple and intuitive, just limit the ruler to the required size, lock the screw and it can be easily used Specification: Material: Carbon Steel Size Chart: 4.9cmx5.0cmx0.9cm/1.93inchx1.97inchx0.35inch Package Includes: 1 positioning block Note: Please allow slightly errors due to manual measurement and different monitors.