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 Adjustable & Locking Mechanism: Equipped with a movable ruler and locking nut, allowing easy angles adjustments and secure positioning during measurements for efficiency Multi Functional Design: Combines angles measurement, marking, and cutting guidance in tool, perfect for woodworking, construction, and projects requiring high accuracy 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 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, Manufacturer: Jazuaiao