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About the item A modified version of the original IIW-Type 1 design in a inch version, design based on International Institute of Welding, ASTM E164 and U.S. Air Force NDI Manual T.O. 33B-1-1 Includes a 2.0" radius x .250" deep cut-out superposed on the 4.0" radius for distance calibration. Also includes numbers 3, 5 and 8 through holes (3/64", 5/64" AND 8/64" diameter) for sensitivity testing or surface wave inspection, and distance calibration marks to the 2.0" hole. Dimensions: 12.0" x 4.0" x 1.0" Material: 1018 Steel Weight:6 KG Package Including: 1 unit calibration block 1 suitcase 1 certification