right angle ruler 2 accuracy level 90 degree flat edge square measuring tools 100 x 70mm

both the inside and outside of the flat edge square are 90 degree angles. it is an industrial and professional tool for assembly and platform operation. all faces and edges are ground and lapped for straightness and parallelism. 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..syi