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Surface plates and angle measurement blocks crafted from black granite exhibit superior properties. We provide all the suitable accessories, such as precision rules and V-blocks, for surface plate applications in labs or workshops to test uniformity, perpendicularity, parallelism, concentricity, and more. Compressive Strength: 250-260 N/mm Standard: DIN 876 / 0 Mohs Hardness: 6-7 Corrosion Resistance: Free Thermal & Dynamic Stability: Excellent Electrical & Thermal Insulation: Non-Conductive Material: Blue-Gray Rectified Granite with Fine Light-Colored Inclusions Range 400 Millimeters Brand Name KNUTH Manufacturer KNUTH Material Type Granite