... *20inch or 500mm*500mmMin Trace/Gap0.10mm, or 4milsMin Drill Hole Diameter0.01'',0.25mm, or 10milsSurface FinishHASL,Nickle,Immersion Gold ... AssemblyTechnical requirement for pcb assembly:1) Professional Surface-mounting and Through-hole soldering Technology2) Various sizes like 1206,0805,0603 components SMT ...