Qzc Set of 10pcs Bike Valve Converter Presta to Schrader Bicycle Bike Valve Adaptor Tube Pump Tool Material: Zinc Alloy ( Copper Plated ). Size:Approx.1.5cm x 0.9cm x0.7cm.(L*Big head diameter*Small head diameter) Convert a Presta valve to a Schrader valve - suitable 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.Rocket shape makes the bike look more attractive and special Direct replacement,easy to install, only use the wrench to put the caps onto the tire valve stem Package including: set of 10pcs Bike Valve Converter Presta to Schrader Bicycle Bike Valve Adaptor