Easy to distinguish the positive negativeRed is connected to a positive electrode, blue is connected to a negative electrode,The red and blue covers are easy to identify to avoid the risk of electric shock. Easy installationThe battery terminal clamp can quickly connect and remove. Fix the battery terminal by tightening the cap, lift the cap to remove from the battery terminal, removed as soon as you pull it. SpecificationPositive electrode diameter: about 19mm / 0.75inch ; Negative electrode diameter: about 17mm / 0.67inch; Maximum cable size: 60mm. High QualityHigh-end brass quick release battery terminals and thickening ABS, rust and corrosion, stable and good conductivity, reduce current loss of current. Wide ApplicationQuick release battery terminal clamps apply to most conventional terminal batteries with cylindrical dimensions. Suitable for 12/24V battery of car, caravan, motorhome, boat, truck, vehicle, RV, ATV and etc.