1The fuse holder block is mainly used to connect the audio power cord for protecting audio system 2It prevents excessive current and avoid the line overheating, which will be cut off automatically when current is too strong 3Wire sizes are as follows: 2 * 0GA/4GA in, 4 * 4GA/8GA out, and 2 * 0GA/4GA in, 4 * 4GA/8GA out 4Comes with removable clear plastic insulating cover and the nickel plated contact that not easy to fade 5It is universal fit for car, boat, RV or other vehiclesFeatures:The fuse holder block is mainly used to connect the audio power cord for protecting audio system. It prevents excessive current and avoid the line overheating, which will be cut off automatically when current is too strong. Wire sizes are as follows: 2 * 0GA/4GA in, 4 * 4GA/8GA out, and 2 * 0GA/4GA in, 4 * 4GA/8GA out. Comes with removable clear plastic insulating cover and the nickel plated contact that not easy to fade. It is universal fit for car, boat, RV or other vehicles. Specifications: Condition: 100% Brand New Material: Plastic, Zinc Alloy Block Color: Silver Case Color: Clear Base Color: Black Case Size: 163 * 90 * 30mm / 6.4 * 3.5 * 1.2in Package Weight: Approx.441g Fitment: For car, boat, RV or other vehicles4 Way Fuse Block Include: 2 * 30A fuses, 2 * 60A fuses Input: 2 x 0/4GA Output: 4 x 4/8GA2 IN 4 OUT Battery Distribution: Input: 2 x 0/4GA Output: 4 x 4/8GAPackage List: 1 * Fuse Holder 2 * 100Amp FusesNote: With Red LED, when the fuse is not working, the light will be on. Then you can clearly know if the fuse block is normal.