Battery Terminal Wing Nut Style - Positive/Negative Set Wing Nut Style Battery Terminals convert battery posts to stud connectors and permit quick disconnection from the battery. Polarity specific to meet USCG regulations. Die cast lead construction. WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.