Lead Battery Terminal - 5/16" & 3/8" Stud - Positive & Negative Combo Pack. Stud Size:5/16 " & 3/8". Product Features:. Seamless barrel design allows for maximum strength when crimped. Closed end design seals out moisture so cables stay dry and corrosion free. WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.