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.Waterproof and really a great apparatus electronic connector. Specifications: Product Name: Aviation ConnectorPin Number: 3 pinsPin Diameter: 1mmMounting Hole Diameter: 8mmNet Weight: 13gCoupling: Thread coupingContact Material: Brass (Gold plated)Color: Silver Tone Package Included: Package Content: 1 x Aviation Connector