Universal Truck Motorcycle Boat Car Battery Terminal 1set ( Positive 1pcs + Negative 1pcs) . Fits 6V/12V positive or negative battery, Battery is not included in our package. The main components of the Battery Terminals Connectors is made of copper. The screw and nut are not copper. This Battery Terminals Automotive is suitable for use in most vehicles,Fit for most car, boat, van battery. Battery Terminal Connectors made of Copper material has good conductive performance, good flexibility. Specification: Color: Red+Black. Material: copper+Plastic. Positive inner diameter: 18mm. Negative inner diameter: 17.5mm. Note: There might be a bit color distortions due to different computer resolutions. There might be size errors due to different computer resolutions. Package include: 1 * battery terminal red - identification plus (+). 1 * battery terminal black - identification minus (-).