Replacement jumper clamps are heavy‑duty alligator‑style clamps used to restore or upgrade worn‑out clamps on car jumper cables, giving you a fresh, dependable connection when jump‑starting a vehicle. They usually feature strong spring‑loaded jaws with serrated copper or copper‑alloy teeth and insulated handles to ensure good electrical contact and minimize the risk of slipping or accidental short circuits. Many replacement clamps are rated for high current (e.g., 600 A or more), making them suitable not only for standard cars but sometimes even for heavier vehicles or marine batteries — as long as the rest of the jumper setup (cables, wiring gauge, etc.) supports the load. Because you’re only replacing the clamps rather than buying a whole new set of cables, replacement clamps can be a cost‑effective way to keep jumper cables functional and reliable over time.