1、Both the inside and outside of the Flat Edge Square are 90 degree angles. 2、It is an industrial and professional tool for assembly and platform operation. 3、All faces and edges are ground and lapped for straightness and parallelism. 4、There is a groove milled in the inner corner to provide clearance for burrs and debris. 5、Level 2 square is especially suitable for workshop workers to produce self-tests. Features: Both the inside and outside of the flat edge square are 90 degree angles Used for right angle measurement and can measure the vertical deviation of the inner and outer corners of the workpiece. It is an industrial and professional tool for assembly and platform operation. All faces and edges are ground and lapped for straightness and parallelism. The flat edge square and the crossbar are precisely ground and polished. There is a groove milled in the inner corner to provide clearance for burrs and debris. Level 2 square is especially suitable for workshop workers to produce self-tests. Specification: Condition: 100% Brand New Item Type: Right Angle Ruler Material: Steel Accuracy Level: 2 Package List: 1 x Right Angle Ruler Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.