Jameco carries a wide selection of high quality shunts & shorting blocks rectangular connectors in a variety of colors & configurations. The black or red socket shorting block close 1000MOhm 5mm are RoHs compliant with a phosphor bronze pin material. We've helped millions of customers from businesses to educational institutions to hobbyists and along the way we're proud to have built a solid reputation for great prices, great selection, and a great source for hard-to-find electronic components.