The alligator clips are made of high-quality copper and are highly conductive. The insulating sheath provides a comfortable touch and ensures your safety. Rated current: 100A. The metal alligator clips are anti-rust, anti-corrosion, anti-oxidation, and have a long service life. The tail of each alligator clip can be connected to the wire by welding. The red and black housings help you identify positive and negative charges. The spring is made of high-quality metal and can withstand greater pressure, strong bite force, and will not loosen after clamping. Maximum opening: 25mm. It is widely used in electrical engineering, voltage testers, and automobile and truck batteries. They can be used to replace garage battery chargers and others, such as solar panels, electric fences, motorhomes, boats, lawnmowers, etc. Package includes: 3 pieces red metal crocodile clips + 3 pieces black metal crocodile clips.