UR2-D Wire Connector 1.Max insulation O.D.2.08mm(0.082"); 2.For solid cooper 0.9-0.4mm(19-26 AWG) cable. UR2-D Wire ConnectoroC.3.All materials used in the connectors shall be non-toxic and dermatologically safe.oC to 70oC and humidity range of 0% to 85%.