The 3744A-02 is a Spade Lug to Banana Jack Adapter Set accepts #4, 5 and 6 lug size. Banana jack is made of brass (as per QQ-B-626) with nickel plated finish (as per QQ-N-290) and polypropylene insulation. Spade lug is made of copper with electro-tin plated finish. Available in red and black colours.