... Printed Circuit Board:We offer;PCB,PCBA,Singe-side PCB,Double-side PCB, Multilayer PCB,Mluminium PCB,spray tin PCB,Immersed ... .1mm (minimum)Inner layer dielectric thickness (1/2 mils PI with 15um adhesive): 0.0275 to 0.1mmHole diameter tolerance of ... milsHole diameter tolerance of NPTH: ±1 milHole position tolerance (compared with Gerber data): ±1 milThickness of PTH hole copper: 8 to ...