Mega Fuse Holder with 5/16 inch studs and cover with insulated boot terminal protectors. Fuse holders are an ideal option for housing your fuses while also offering fuse circuit protection. Fuse holders are available in different styles and amperages, this Mega Fuse Holder has an amperage rating of 250A. It is important to make sure the fuse amperage is accurate per its application or the fuse will not blow as intended and it will not serve as protection.