【21 PCS WIDE APPLICATIONS】 You can use any \"standard\" Schrader valve bicycle pump and use the Presta valve to inflate tires; such as yoga ball, fitness ball, kickball, pilates ball, swimming ring, basketball, football, volleyball, rugby, balloon, etc. If you are a sports ball lover or have a variety of inflatable toys for children, this is the best choice. 【QUALITY MATERIAL】 Made of high-quality brass and plastic, with threads, corrosion-resistant and not easy to break; with a rubber sealing ring; durable, long-lasting use and long service life; suitable for compressors, electric air pumps and almost all manual pumps. 【AIR PUMP MAINTENANCE KIT】 21 pcs different sizes and specifications of inflatable tools can meet your needs. The inflation pump nozzle kit includes -4x DV/SV adapter, 2x AV adapter, 2x SV adapter, 2x metal needle, 4x balloon nozzles, 1x air hose, 6x plastic nozzles. 【GREAT BIKE VALVE ADAPTER】 Used to inflate bicycle tires and MTB tires, Dunlop valve (DV), Presta valve, Lightning valve (BV), Sclaverand valve (SV), Presta valve to => Schrader / Car valve (AV). 【PORTABLE BOX】 Air pump with box and perfect manual, these bicycle adapters are very light and small and can be placed on the Presta valve; it is very convenient to carry and can be placed in any backpack and ball bag with side pockets; not easy to lose, it has become a daily tool for most families, and it is now in the shopping cart in the car.