The superior design of this battery washer maintains positive contacts, ensuring reliable operation every time.Installing it is easy - just place it on the positive post of your battery and you're done. Performance Tool W1658C Top Post Battery Washer, 1 Pack Made from high-quality materials, it provides long-lasting protection against corrosion, ensuring the longevity and reliable performance of your battery. Compatible with most vehicles, this battery washer is a versatile and reliable choice.