NAVY EDDY CURRENT STANDARD TEST BLOCK.Dimensions: L X W X T (7.0” X 4.0” X 0.875”).Description: Eddy Current Standard Test Block for the Navy Universal Eddy Current Standard for the Navy. a (3) plate assemblage with a total of (71) EDM notches distributed across its (20) fastening holes.Geometry: 3.0" broad by 4.0" length by.875" thick.Material : Carbon steel,Stainless Steel,Titanium,Aluminum,Alloy Steel,Cupro Nickel,Inconel etc.