Package Contents: 2 x 500 Amp Battery Charger Clips (Black + Red), 2 x Crimp Ferrules, 2 x Screws and 2 x Nuts. They are useful for connecting components to wires. Pure Copper Material: The conductors of the alligator clips are made of pure copper for optimal contact and performance, with an insulated handle for convenient use. Sturdy: This battery clip is equipped with extremely strong jaws that do not easily come off once properly tightened. And with a powerful spring, it takes a firm grip. Size and Compatibility: The size of each large alligator clip is about 15.5cm x 12cm x 3cm, easy to handle. Input: 12V, 24V, 36V; Supports up to: 500Amp maximum current Wide range of applications: Ideal for use with household soldering tools and electrical testing tools. Widely used for various electrical projects, voltage testers. Suitable for all car and truck batteries