MEETLOCKS New Bike Tube Adaptor,5 Pcs & 10 Pcs pack,Tube Pump Tools,Converter Presta to Schrader Solid Brass Material New Solid Brass Materials(Not Zinc Alloy). Convert a Presta Valve to a Schrader Valve. Size:Approx.1.5cm x 0.9cm x0.7cm.(L*Big head diameter*Small head diameter) High Quality & Easy To Use.