The Performance Tool NBR Vacuum Cap Assortment Kit is a must-have for any mechanic or DIY enthusiast. Made from high-quality Nitrile Butadiene Rubber (NBR), these vacuum caps are heat-resistant and durable, ensuring long-lasting performance. The kit includes a range of sizes, including 3/16", 5/32", 7/32", 1/4", 5/16", and 3/8", ensuring you have the right size cap for any job. These vacuum caps can be used on carburetors, manifolds, and other vacuum connections, making them a versatile addition to any toolkit. With 80 pieces included in the kit and a convenient storage case, you'll always have the right cap on hand when you need it.