1Versatile Modular Design: The modular ruler offers unparalleled versatility for your woodworking projects. Its modular design allows multiple configurations to meet various measuring needs, including side groove positioning and circular performances, making it an necessary tool for professionals and hobbyists alike. 2Accuracy Positioning and Measurement: The side groove positioning head ensures accurate positioning and measurements, enhancing work accuracy. Whether marking for fine woodworking or laying out intricate designs, this feature ensures accurate measurements, reducing mistakes and improving overall project quality. 3Multi Functional Use: In addition to basic measuring functions, this ruler doubles as a drawing compass. The drawing circular function is ideal for creating accurate circles and arcs, simplifying tasks that require guiding and marking circular patterns. This multi functional capability streamlines your workflow, saving time and energy. 4Enhanced Usability and Efficiency: Easy to read markings and user friendly design make this tool easy to use. Its ergonomic design promotes efficient and comfortable performance, allowing you to use it for extended periods without fatigue. Ideal for intricate and detailed work, it helps you achieve accurate results with ease. 5Robust Construction: Constructed from premium aluminum alloy materials, the modular ruler withstands frequent use. Its sturdy structure ensures long lasting durability and stable performance, making it a reliable addition to your tool kit. 2 x Main Body of Positioning Ruler 2 x Drawing Circle Positioning Pillar 2 x 135mm Stainless Steel Pillar 2 x 178mm Stainless Steel Pillar 6 x 313mm Stainless Steel Pillar 2 x Nut Positioning Head 2 x Internal Frame Positioning Head 2 x Diagonal Line Positioning Head 2 x Side Groove Positioning Head 1 x Hex Wrench 2 x Pencil 1 x Storage Box 1 x Instruction Manual