... capability:1.Layer: 2-22 layer2.Product type: Rigid PCB,High Density Inverter PCB,thick copper PCB3.Materials: FR-4, CEM ... Substrate, Rogers, Halogen Free, High Tg 4.Copper Thickness: 140micron(4oz)5.Min Board Thickness: 0.4mm6.Max Board Thickness: 5.0mm7.Min ... hole thickness to diameter ratio: 0.8:117.Maximum working board size: 520*622mm18.Drilling Tolerance (PTH): ±0.075mm19.Drilling tolerance ...