【Wide Range of Usage】These bike tire caps and bike valve stem adapters are suitable for road bike, folding bike, and most mountain bikes use . If you are a sports lover or have a variety of bike , this is the best choice. 【Bike Presta Valve Adaptors Kit】This bike accessory kit comes with 2 presta to schrader adapter, 4 presta valve caps, 2 schrader valve caps and 2 valve core removal tool caps; nice combination and enough quantity can meet your actual needs. 【Quality Material】Made of CNC Anodized Aluminium Alloy, with threads,corrosion-resistant and not easily broken; can support for a long time using. 【Easy to Install】screw on the presta valve adapter as though you were going to fill your tire, then screw this cap on over the open presta valve,then you can inflate the tire with tools. 【Portable Box】These bicycle adapters are very light and small and can be placed on the Presta/Schrader valve; it is very convenient to carry and can be placed in any backpack ; not easy to lose, take these accessories and enjoy your bike trip.