Custom Eddy Current Bolt Hole Calibration Standard. Total of 35 Hole Sizes: Diameters 3.0mm, 3.2mm, 4.0mm, 4.2mm, 4.6mm, 5.0mm, 5.4mm, 5.8mm, 6.2mm, 6.6mm, 7.0mm, 7.4mm, 7.8mm, 8.0mm, 8.2mm, 8.6mm, 9.0mm, 9.4mm, 9.8mm, 10.2mm, 10.6mm, 11.0mm, 11.4mm, 11.
