Material: zinc alloy Description: KEEP ALL WIRES SAFE AND TINY - The MNJ motor battery connector has a standard 0/4/8 AWG gauge, allowing you to connect many different sizes to the same terminal, and then connect your car battery. It's safer, nicer and perfect for battery terminals Real-time monitoring of battery voltage: Equipped with a 12-24V voltmeter, the error is less than 0.5V, it can correctly detect the real-time battery voltage of the car, and easily understand the usage of the battery Effectively prolong the service life of the battery: Made of high-quality zinc alloy material, coupled with pure copper fastening ring, strong and durable, with better electrical conductivity, which can protect the car battery terminals from corrosion and make the battery life longer long Better Protection: The transparent acrylic cover can effectively prevent dust and damage from the surrounding environment, better protect the wires and battery terminals Powerful function: adopt standard international car battery 17.5mm universal caliber, suitable for most car batteries Package contains: 2* car batteries Note:1. Please allow a little error due to manual measurement. Please make sure you do not mind before bidding.2. Due to different monitors, the color may vary, please understand. Note:Hello, please pay attention to your shipping address when purchasing the product. If your receiving information (eg: name, street, house number, doorbell/email with no name, etc.) is incorrect, the order will not be delivered correctly.21mm