... .20 years experience. OEM fr4 pcb Welocme to tianweisheng, We are professional OEM FR4 pcb manufacturer in china specialize in pcb, pcb assembly and FPC, UL ... packingVacuum packing,Plastic bag12Outer packing standard carton paking13Hole tolerancePTH:±0.076,NTPH:±0.0514CertificateUL,ISO9001,ISO14001,ISO/TS16949,ROHS15profiling punchingRouting,V-CUT ...