Widely used in aviation, navigation, construction site, port, dock, and some other sealing electronic equipments. Design with a black short rubber tube on the end, mainly used for the electronical connection between the cables. Really a great apparatus electronic connector. Specificatios:Product Name: Aviation ConnectorModel: P28K1QTerminal Number: 2 TerminalsThread Dia: 28mm/1.1inchRated Voltage: 500VNet Weight: 130gCoupling: Thread coupingInsert Material: PPSShell Material: Zinc alloy with chrome platingContact Material: Barss with gold platingColor:BrownContact Resistance: 2000MohmTemprtature Range: -25~80CQualification: CE Package Include:Package Content: 1 x Aviation Connector