... : 0.1mm Max. Board Thickness/Hole Ratio: 12:1 Min. Solder Mask Bridge: 4mil (Min. SMT Pad Space 8mil) Min. Legend ... . Legend(Silkscreen) Height: 30mil Min. drilling slot size: 0.6mm Solder mask color: green, black, blue, white, yellow, and matt, etc ... . Solder mask hardness: 6H Legend/Silkscreen Color: white, yellow, black, etc. ...