The Performance Tool Universal O-Ring Assortment is a 419-piece set of high-quality nitrile rubber O-rings designed for automotive use. This assortment includes a variety of sizes and measurements to accommodate different applications, with the majority of pieces conforming to ASTM D-2000 and SAE J200 standards. The set comes in a convenient black plastic box for storage and organization, making it easy to keep essential tools and hardware on hand for maintenance tasks. With an average delivery time of 2-3 days, this O-ring assortment is a versatile and essential addition to any automotive tool collection.