5Pcs Presta to Schrader Converter Car Valve Adapter Bicycle Bike Tube Pump Tools 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 Also turn a UK valve into a US valve Used with a Bicycle Pump or an Air Compressor.