... , High Tg FR4, FR1, CEM-1, FR-4,etc Board Thickness: 0.4-6.0 mmTreatment : Lead Free HASL, ENIG, Immersion ... Minimum spacing0.075mm 6 Minimum aperture0.1mm 7 Hole Wall Copper Thickness0.025mm 8Metal tolerance of aperture±0.08mm9 Diameter tolerance ...