CKAuto valve stem caps feature a corrosion-resistant plastic interior and stylish metal exterior to prevent rust and protect valve threads. Made from high-grade, lightweight aluminum alloy with anodized and powder-coated finish for durability and vibrant color. Easy to install with a threaded design for quick removal or tightening. With a 7mm inner diameter and 13.8mm height, they fit most cars, bikes, SUVs, trucks, and RVs. Designed for both performance and appearance without thread corrosion.