... hole tolerance±0.002” (0.050mm)Angle of Countersink80°,90°,100°,120°PlatingMin. hole size0.0008” Aspect ratio20EtchingTrace width tolerance±20 ... ,black,matte black,dark brown,yellow,red,blue,transparentMin. solder mask clearance0.003”Thickness0.0004”SilkscreenColorWhite,black,yellow,red,blue,greenMin ... to surpass them. PCB Printed Circuit Board 2layer Black Solder Mask