Lead Battery Terminal – 5/16″ Stud – NegativeStud Size:5/16 “Product Features: ANCOR Marine Grade lugs are manufactured from heavy duty annealed tinned brass, providing for maximum current flow100% tin plated brass resists corrosion from salt and moistureSeamless barrel design allows for maximum strength when crimpedClosed 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.