DescriptionThis item convert a presta to a Schrader - s uitable for varied types of bikes, including mountain bike, roadbike, folding bike, especially for mountain bikes. Prevent leakage, dirt and rain water to extend the service life of bike tires. Features- Material: Zinc Alloy(Copper Plated). - Length: 2cm/ 0.79 inch. Above diameter: 0.9cm/ 0.35 inch. Bottom diameter: 0.7cm/ 0.28 inch.-Light, easy and convenient to install. -Rocket shape makes the bike look more attractive and special. -Best replacement for your old or broken one. -Direct replacement,easy to install, only use the wrench to put the caps onto the tire stem. -To tire mouth design, filar silk closely, gently turn only.