This 3D Multi-Angle Carpenter's Square is a versatile, high-precision marking and measuring tool crafted from durable anodized aluminum alloy, specifically designed for woodworking and construction layout . It features a unique 3D L-shaped design that allows for simultaneous 90-degree marking across adjacent surfaces, while integrated preset holes (22.5° to 75°) and a removable angle pin enable rapid, accurate miter measurements [1, 3, 4]. Beyond angle marking, the tool serves as a comprehensive workshop assistant with built-in drill diameter gauges (Φ2–Φ10 mm) and a precision hole-scribing grid for drawing consistent parallel lines. Its compact, CNC-machined body provides clear, laser-engraved scales for long-term readability, making it an essential multi-functional instrument for engineers and DIY enthusiasts alike.