InnoLife 10 Pcs Aluminum PRESTA to SCHRADER Converter Car Valve Adapter Bicycle Bike Tube Pump Air Compressor Tools (mixed colors) 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 Also turn a UK valve into a US valve