1Protect Audio System: Fuse holders will protect your controllers, wires and batteries from overcurrent and protect audio video system. 2Universal Application: Automotive fuse holder is suitable for car, boat, Rv, yacht, truck audio video systems or other vehicles. 3Fine Workmanship: Fuse holder terminal kit is made of copper alloy and Pc, gold plated on the surface, heat resistant, melting resistance and good conductivity. 4Waterproof Transparent Cover: The clear cover is designed to allow you to visually see the operation of the fuse, and the waterproof cover protects the internal fuse from water and further damage. 5Package Contents: The package includes 2pcs fuse holders, 4pcs copper ring terminals and 4pcs Heat shrinkable tubes, high performance, strong reliability.