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Contact SupplierMini Angle Beam Block 12.5mm 1018 Steel (Inch Version) Geometry:1.0" radius opposite a 2.0" radius, and a 564" diameter x .375" deep flat-bottom hole. Dimensions: 1.000" thick. (also available in .500" thickness, see here) This Miniature Angle Beam Block is also known as a "Rompas" block or simply "Angle Beam," and it is the ASTM and U.S. Air Force substitute for the DSC block for distance, beam index, refracted angle and sensitivity calibration. In accordance with ASTM E164 and U.S. Bureau of Public Roads, Type B specifications.