100% <br />convenient and reliable <br />pure copper with 24k gold plating for maximum signal transfer and durability.<br />double screws locking to secure the cable<br />easy to fit for wire size up to 4mm.<br />accept speaker wire: <br />8awg， 9awg， 10awg， 11awg， 12awg， 13awg，14awg， 15awg， 16awg， 17awg， 18awg， 19awg， 20awg<br /><br />specifications:<br />material: copper pin and aluminium alloy cover<br />size: <br />cover internal diameter: 8mm<br />wire hole internal diameter：4mm<br />pin diameter: 4mm<br />pin length: 37mm<br />total length: 45mm<br /><br />attention:<br />4 x 4mm banana plug  b1 is including 2 pairs banana plug<br />8 x 4mm banana plug  b1 is including 4 pairs banana plug <br />12 x 4mm banana plug b1  is including 6 pairs banana plug <br />16 x 4mm banana plug b1  is including 8pairs banana plug<br />20 x 4mm banana plug b1 is including 10pairs banana plug<br /><br />package includes:<br />quantity of banana plug your choose (4 x/8 x/12x/16x/20x)