MDR Plug Connectors 3M MDR Plug Connectors are designed around a fine pitch ribbon-style contact for reliable electrical connections. The MDR Plug Connectors provide wiper-on-wiper contact for reliable repetitive plugging and accept a wide variety of cable constructions including flat, round, twisted pair and twinax cables. The integral dimples of the MDR metal shell ensure proper grounding of the shroud before mating, reducing the possibility of a destructive ESD event between the boardmount and wiremount connectors. Most MDR connectors feature 360 degree shielding around the entire interface to help improve EMI and RFI protection in sensitive applications. 3M MDR Plug Connectors are available in both insulation displacement (IDC) and solder termination versions.