T-Spec VAGU AGU Fuse Holder 4 to 8 AWGVAGU AGU Fuse Holder 4 to 8 AWG Fusing an aftermarket stereo system provides protection for your car and your car stereo. No fuse system provides better protection than T Spec. The new T Spec compact brass designs are constructed from solid brass and are smaller than anything else in the industry. This combination of top quality materials and thoughtful design provides an incredibly reliable and simple to install product that will last for years.