All buses and fuse clips are tin plated copper for corrosion resistance and optimal electrical conductivity. All ST Blade fuse blocks utilize a specialized fuse clip that is designed to hold fuses in place in the harshest conditions. All fasteners are stainless steel. Screws contain a captive star lock washer for a faster more secure installation. Studs utilize flange nuts for a simpler and safer installation. Fuses sold separately.