Heavy Copper Board Thick Copper PCB, Heavy Copper Board, Flexible Rigid PCB, Fr4 PCB, Customized PCB Supplier Product Type: Heavy Copper Board Application Field: High-Power Supply Module/Heavy Current Industrial Device Layer/Board Thickness: 4L/3.0mm Surface Finish: ENIG Trace/Space: 20/20mil Smallest Hole Diameter: 0.8mm Technical Feature: Copper thickness 18OZ PCBMAIN can provide PCB Board include Thick Copper PCB, Heavy Copper Board, Flexible Rigid PCB, Fr4 PCB.