Features 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, anti‑rust and anti‑corrosion, can be used in various harsh environments. 4、Adopt one‑piece 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 Ruler Material: Stainless steel Model: DIN 875 50x40 Product 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 / 0.2in Purpose: Suitable for detecting angles and marking on parts Package List 1 x 90° Knife Edge Ruler