SODIAL(R) Brass Pump Adaptor Presta Valves Converter Schrader Valves Adapter --- Great for Bike Bicycle Swell the tire in the car of foot pumps and compressors Schrader valve of the valve material: zinc alloy (copper plating) brass valve adapter size (about): 1.5cm / 0.6 '; diameter -0.8cm & 0.7cm