Features Accurate 90 Degree Angles: Both the inside and outside of the Flat Edge Square form perfect 90 degree angles, ensuring precise measurements and layouts for carpentry and engineering tasks. Industrial and Professional Tool: This square is designed for industrial and professional use, making it an essential tool for assembly and platform operations, providing accuracy and efficiency for engineers and workshop workers. Ground and Lapped Edges: All faces and edges are ground and lapped, guaranteeing straightness and parallelism, delivering reliable and accurate measurements for layout tools and engineer measure tasks. Groove for Clearance: The inner corner features a milled groove to provide clearance for burrs and debris, ensuring smooth and precise operation for 90 Degree Ruler and Carpenter Squares. Level 2 Square: Especially suitable for workshop workers to produce self-tests, this Level 2 square provides high precision and accuracy for a wide range of layout tools and carpentry tasks. Professional Right Angle Ruler Ensure perfect 90-degree angles with yunyi's Right Angle Ruler. This industrial-grade tool is meticulously crafted for assembly and platform operations. Ground and lapped faces and edges ensure exceptional straightness and parallelism, while the inner corner groove provides clearance for burrs and debris. Take precision to the next level With accurate inside and outside 90-degree angles, the Level 2 square is ideal for workshop workers to produce self-tests. Elevate your workmanship with yunyi's Right Angle Ruler and experience unparalleled precision and efficiency in your projects. Package List