Brass valve adaptor Material: zinc alloy (copper plated). Convert a presta valve to a schrader valve This will enable you to use a car foot pump or compressor to inflate your tyres Size (approx.): 1.5cm/0.6"; diameters-0.8cm & 0.7cmDescription: Brass valve adaptor Material: zinc alloy (copper plated). Convert a presta valve to a schrader valve This will enable you to use a car foot pump or compressor to inflate your tyres Package included: 1 PRESTA TO SCHRADER VALVE CONVERTER BIKE PUMP ADAPTOR