If you're looking to replace the lock barrel on your Fatfish e-bike's battery, this set is exactly what you need. It includes both a main and spare key, giving you added security and peace of mind. Each lock barrel is uniquely coded to fit your e-bike, ensuring that only your keys will work with it. The inclusion of a spare key is a lifesaver—if one ever gets misplaced, you’ll still have access to your battery without any hassle. This replacement set is essential for keeping your Fatfish e-bike’s battery secure and functional, making sure your ride is always ready to go when you are.