Yosoo 10 PCS Presta to Schrader Bicycle Bike Pump Tire Inflator Valve Adaptor Convertor Car Valve Adapter Bicycle Bike Tube Pump Air Compressor Tools Light, easy and convenient to install Convert a Presta valve to a Schrader valve Also turn a UK valve into a US valve Used with a Bicycle Pump or a Air Compressor Material: Zinc Alloy (Copper Plated), Size:Approx.1.5cm x 0.9cm x0.7cm.(L*Big head diameter*Small head diameter)