Wowlife Bike Bicycle Valve Adaptor Converter Presta to Schrader Tube Pump Tools Convert a Presta Valve to a Schrader Valve Material: Zinc Alloy ( Copper Plated ) Also turn a UK Valve into a US Valve Size:Approx.1.5cm x 0.9cm x0.7cm.(L*Big head diameter*Small head diameter)