Rademacher Prototyping Boards Prototyping PCB 632293 - WR Rademacher VK C-931-EP The Rademacher VK C-931-EP is a prototyping printed circuit board measuring 160 mm by 100 mm with a 35 μm thickness and 2.54 mm contact spacing. This PCB is ideal for developing and testing electronic circuits before final production. It is commonly used in educational and hobbyist electronic projects.