Navy universal eddy current standard. a (3) plate assembly containing (20) fastener holes with a total of (71) edm notches in various locations. Overall dimensions: .875" thick x 4.0" wide x 7.0" long alloy: 6al-4v titanium (20) fastener holes from .156 to .750" diameter. (40) corner notches, (20) bore notches, (9) surface notches, (1) tapered notch, (1) radius notch all edm notches are .004 ± .001 wide manufactured iaw u.s.a.f. Tech order 33b-1-1, figure 4-40. Pn