Features Precise Square aerofoil: Carefully processed for reduced errors and increased accuracy, ensuring precise measurements for various projects. Thickened Ruler Body: Provides a stable contact area with the measuring aerofoil, enhancing measurement stability and accuracy. Durable Stainless Steel Construction: Resistant to rust and corrosion, suitable for use in various harsh environments for long-lasting reliability. High Accuracy and Quality: One-piece structure processing ensures high accuracy, superior quality, and an extended service life for professional use. Milled Inner Corners: Features milled grooves to remove burrs and debris, ensuring a cleaner measurement aerofoil and improved Clearcutness . 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: 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