High accuracy Measurement: produced of strong aluminum alloy with 90° and 45° angles designs for accurate measurements, solving the issues of traditional wooden squares being prone to deformation and inaccuracy Ideal for professional carpenter and enthusiasts in woodworking and furniture making Multi Functional Design: Combines angles measurement, marking, and cutting guidance in tool, perfect for woodworking, construction, and projects requiring high accuracy Adjustable & Locking Mechanism: Equipped with a movable ruler and locking nut, allowing easy angles adjustments and secure positioning during measurements for efficiency Versatile Size option: Available in multiple sizes (A: 265mm folded / 353mm extended; B: 345mm folded / 433mm extended) to suit different measurement needs, offering flexibility for tasks double Sided Scale & Sturdy Construction: Features a stainless steel ruler body with double sided scales, ensuring durability and clear visibility The robust design enhances longevity for frequent use in various projects, Manufacturer: FGDTREE