Feature:1. Manufacturing Material: Made of high quality aluminum alloy and rubber materials, it is strong and durable, which undoubtedly extends its service life.2. Quenching and Oxidation Processing: Quenching processing, surface anodic oxidation treatment, it is wear resistant, not easy to rust, and has high gloss.3. Built in Rubber Sealing Ring: Built in rubber sealing ring, easy and effortless pumping, can effectively avoid air leakage.4. Special Air Nozzle Converter: Bicycle special air nozzle converter, presta valve to schrader valve converter.5. Purpose: Installed on presta valve, it is convenient to use the schrader valve air cylinder to pump.Specification:Item Type: Mountain Bike Pump AdapterWeight: Approx.4g / 0.1ozMaterial: Aluminum Alloy + Rubber Sealing RingProduct Size: Approx.15 x 9.5mm / 0.6 x 0.4inFeatures: Built In Rubber Ring To Avoid Air LeakagePurpose: Installed On Presta Valve, It Is Convenient To Use The Schrader Valve Air Cylinder To Pump..Package List:2 x Schrader Valve And Presta Valve ConverterNote:Please allow 01 inch error due to manual measurement. Thanks for your understanding.