General description A set of standard 1/4" D BA sockets from 0BA to 10BA, manufactured from satin finish chrome vanadium. Technical specifications Socket sizes: 0BA, 1BA, 2BA, 3BA, 4BA, 5BA, 6BA, 7BA, 8BA, 9BA, 10BA Socket length: 25mm Material: Chrome vanadium Usage BA fixings are used on old electrical equipment.