With added convenience, use Invincible Marine 3-Inch Copper Plated Battery Clips onboard your vessel or around the boathouse. These heavy-duty, 30-amp battery clips (15-amps per clip) include one positive and one negative clip, and are used for everything from portable aerators to mobile lights. The copper plated clips are easy to open and grip tightly, including a red and black clip with a 3-inch copper plated clip.