1.Convenient:The bike valve adaptor is easy to install, you can inflate your bike tires after mounting, portable 2.Material:Made of aluminum alloy material, , ready to inflate tires 3.Applicable:These bike inflate tire valve adapter convert presta can convert French/UK style to US style, suitable for mountain bikes, road bikes, folding bikes, and so on 4.Excellent sealing effect, very good to avoid leakage, so as to extend the service life of bicycle tires. 5.They are and take up very little space in an emergency bag, but they can be very useful in an emergency. It is suitable for all types of bikes, including mountain bikes, road bikes, folding bikes, especially mountain bikes.Direct replacement, easy to install, just use a wrench to cover the tire valve rod can be.It is the best replacement for your old or worn . Colour:Silver Material:Aluminum Alloy Package Contents: 50 x Bicycle valve adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.