These are heavy-duty car battery booster jumper cables, also known as jump leads.
They are used to jump-start a dead or weak battery in cars, vans, trucks, and other heavy-duty automobiles.
The cables feature color-coded red (positive) and black (negative) wires and clamps for easy and safe use.
The clamps have insulated reinforced handles for protection and anti-slip gripping.
Various models handle different amperages (e.g., 500A to 2000A) and are suitable for different engine sizes.