Feature:1. The square surface is carefully processed to reduce errors and make the measurement more accurate.2. The ruler body is thickened to increase the contact area with the measuring surface, and the measurement is more stable.3. Made of stainless steel, antirust and anticorrosion, can be used in various harsh environments.4. Adopt onepiece structure processing, with high accuracy and high quality, and longer service life.5. There are milled grooves in the inner corners to remove burrs and debris and make the measurement surface cleaner.Specification:Item Type: 90 Knife Edge RulerMaterial: Stainless steelModel: DIN 875 50x40Product Size (L x W): Approx. 55 x 38mm / 2.2 x 1.5in (Including Base)Approx. 50 x 40mm / 2 x 1.6in (Without Base)Thickness: Approx. 5mm / 0.2inPurpose: Suitable for detecting angles and marking on parts.Package List:1 x 90 Knife Edge Ruler