Metal Bodied 90° Panel Mount PCB Plugs (MDR) These 3M 101 Series Mini D Ribbon (MDR) Boardmount Shielded Plugs have a 0.050 inch (1.27 mm) pitch. The material of the main body of these 101 Series Mini D Ribbon (MDR) Boardmount Shielded Plugs is nickel plated zinc alloy.