Product Description IIW-Type 2 (Aluminum or Steel) A modified version of the original IIW-Type 1 design. 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) and distance calibration marks to the 2.0″ hole. In accordance with International Institute of Welding, ASTM E164 and U.S. Air Force NDI Manual T.O. 33B-1-1 specifications. Dimensions: 12.0″ x 4.0″ x 1.0″ NSN (National Stock Number) is 6635-00-415-9225 Please specify Aluminum or Steel in comments field at checkout
