Used for longitudinal, shear, and surface wave sensitivity calibrations. Inch Contains six flat-bottom holes: three 4/64″ diameter, one each at depths of 0.050″, 0.250″, and 0.500″; one 4/64″ diameter at 1.500″ deep; one 8/64″ diameter at 1.625″ deep.
Available In: Inch, Metric