Flammi 5 Pcs Aluminum Alloy Converter Presta to Schrader Bicycle Bike Valve Adaptor Tube Pump Tools Material: Zinc Alloy ( Copper Plated ) Size: Approx. 1.5cm x 0.9cm x0.7cm (L x Big head diameter x Small head diameter) Convert a Presta Valve to a Schrader Valve. Also turn a UK Valve into a US Valve 5 pcs Air Compressor Adapter Tools