... MaterialConstruction TechnologySingle-sided PCB,Double-sided PCB,Multi-Layer PCBMaterial Type94VO,FR-4,CEM-1,CEM-3, ... 87milHole Diameter TolerancePTH: ±3mil ; NPTH: ±2milHole Position ToleranceOuter Layer Drilling: ±3mil; 2nd Drilling:±4milDrilling Roughness 1.0milMin. ... ( 3.94mil )Min. Annular Ring Inner Layer: 9.84mil; Outer Layer: 7.87milFinal FinishSurface FinishesCopper Plating; Gold Plating/ ...