The jumper clip is made of 100% pure copper with good conductivity,Minimize transmission loss during connection, with an insulated handle, which is easy to use.The cable clamp is equipped with a high-strength spring to ensure that it will not fall off when working.Powerful alligator clamp connector suitable for a variety of battery charger items, all car and truck batteries, solar panels, camping, boats, electric fences, etc. This is ideal for applications running on battery chargers(suitable for most car jumper portable starters)Recommended for 4,6 or 8 gauge cables. If you have any questions on use, please feel free to contact us.Input: 12V -38V; support up to: 500A current.The package contains two powerful car battery charger clips and a set of screws and nuts.The end of the jumper cable clamp is covered with a removable insulating rubber sleeve to protect the user as much as possible!Don't forget to slide the rubber handles over the wires before you secure the wire-ends to the clamps.