This kit provides a pair of in-line fuse holders and fuses for circuit protection in automotive applications. The fuse holders are compatible with 4, 6, and 8 gauge wire and have a casing to help guard against moisture. The included fuses are a pack of glass tube fuses. The holders are designed to be used with a range of fuse amperages. This product is suitable for car audio amplifier installations and other low-voltage electrical systems.