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AWS IIW Type 1 Calibration Block1018 steel test block for Ultrasonic Flaw Detector About the item Used for calibration of shear and longitudinal transducers, and verification of shear wedge exit point and refracted angle. Can also be used for resolution and sensitivity checking. In accordance with: IIW (International Institute of Welding) and ASTM E164, U.S. Customary Block. Inch version Dimensions: 1.0" x 4.0" x 12.0" Features: 4.0" radius, 2.0" and .060" diameter hole, .240" deep x .080" wide slot, and 1.0" radiussed slot x .060" deep x .120" wide. Material: 1018 Steel Weight:6 KG Package Including: 1 unit calibration block 1 suitcase 1 certification