Frame Length (A): 18.5" Frame Height (B) - Distance Between Fixed Rails: 16.5"Frame Width (C) - Options: 12", 14", 15", 16" or 18" Max. PCB Width (D): 12" Frame - 8.75" 14" Frame - 10.75" 15" Frame - 11.75" 16" Frame - 12.75" 18" Frame - 14.75"