Universally Compatible: By replacing the old valve leak, the tire will be rejuvenated. Good sealing. Stop Air Leaks From Old Valves Durable Quality: Package contains 1 pack of 10 Presta valve cores. These valve cores are copper-nickel plated valve cores. Nickel plating increases the corrosion resistance of the valve core and valve stem, especially when the valve core is installed in an aluminum valve stem. More durable, safer and more reliableValve core removal tool: The package also includes a valve removal tool which allows the French valve to be removed vertically and the French valve core to be removed horizontally. The American valve insert can also be removed Application: Fits Mountain Bike Wheels, Stan's, Vittoria, Continental, Kenda, Bontrager, etc. Also suitable for cars, trucks, motorcycles, ATVs, etc Easy to install: use pliers or a valve removal tool to screw in the Presta valve stem Product name: 10 pieces French valve cores Application: bicycle French valve Material: copper Size: outer diameter 5mm, total length 26mm Name: 1 piece multifunctional gas nozzle disassembly tool Material: Aluminum alloy Size: 54x11x10mm Application: French valve body disassembly and assembly, French valve extension stem disassembly and assembly, American valve body disassembly and assembly Lock: Presta valve core 10pcs 1 valve insert removal tool Valve core removal tools: Removes and installs Presta valve core and Schrader valve core (not all are removable). Removes and installs Presta valve extensions with 5mm flats. Simply clamp or remove valve cores from bicycles, automobiles and other air tires. Main body consists of a hex bar of 10mm which can be turned with a 10mm wrench. Hexagonal surfaces are used to tighten hard to remove valve stems. Fits between the spokes for quick and easy core removal. How to use this bike valve core repair tool kit?Use wrench medium on the Presta valve extender. Use the larger end for the Presta valve core. Use the small end for the Schrader valve core.