Rbenxia Converter Presta to Schrader Bicycle Bike Valve Adaptor Tube Pump Tools 5pcs Light, easy and convenient to install. Convert a Presta valve to a Schrader valve. Used with a Bicycle Pump or a Air Compressor. Material: zinc alloy(copper plated) Size: 1.5cm x 0.9cm x0.7cm/0.59x0.35x0.28