Safe Material: Our product is made of high quality tinned pure copper. Insulation protection, no exposed metal, directly connected to the battery, equipment power supply, safe to use. Size Details: This product includes a pair of battery connectors, which are lightweight. (as the picture shows) Easy Installation: Just tighten the cap to secure it to the battery post. When replacing the battery, simply lift the insulating cover and replace the battery, then replace the clip. Safety Protection: The battery terminals are equipped with durable red (+) and black (-) fixed covers, easily identifiable and avoiding the risk of electric shock. Wide range of applications: These battery terminals are ideal for 12V / 24V positive or negative batteries, and can be widely used in cars, vehicles, motorhomes and boats, and fits nearly all standard size round rod batteries. (As long as the hole size is correct, it can be used)