12V with studs. Steel case with bracket. Available in amperages as follows: 30055-10, 30055-15, 30055-20, 30055-25, 30055-30, 30055-40, 30055-50, in bulk or in box. BP pack available in these amperages: 30055-10BP, 30055-15BP, 30055-20BP, 30055-25BP, 30055-30BP, 30055-40BP, 30055-50BP.