Round Shaped Single Layer Circuit Boards are offered in a metal backed design. Single Layer Circuit Boards are available in a line width and spacing of 6/ 6 mils. Single Layer Circuit Boards are provided with a minimum drilled hole of 0.35mm and punched hole of 0.9mm. Round Shaped Single Layer Circuit Boards come in a thickness of 0.8 to 3.2mm with copper finish of 2 Oz.