Studs Battery Power Distribution Terminal Block Bus Bar BU-1-M6/BU-1-M8 BU-2-M6/BU-2-M8 Car Audio Power Distribution Block. Busbar Screw Stud Terminal Connection. Red and black base with transparent top cover, nickel-plated copper, car audio busbars blocks. Small busbar row, easy to use in less lines, less space. BU-1-M6 is M6. BU-1-M8 is M8. BU-2-M6 is 2*M6. BU-2-M8 is 2*M8. Auto audio distribution box, busbars distribution block. Give us some opportunities for cooperation.