Usage Tips:WHAT YOU GET1 x blue valve core removal tool; 10 x brass valve core for daily use and replacement. SMALL HANDING TOOLThis valve disassemble tool is a small,handy tool designed to remove and install for Schrader and for Presta valve cores and to remove install for Presta valve extenders. UNIVERSAL VALVE COREIt has good air tightness. Made of premium brass, corrosion-resistant, smooth thread, and long service life. EASY TO INSTALLuse a wrench or valve removal tool to screw in the Presta valve stem, one end for the Presta valve core, and the small end for the Schrader valve core. SUITABLE FOR ANY TYPEThe tool fits for Schrader \/ for Presta \/ for Presta Extender \/ for tube tire valve tools,make it become a great replacement tool. The tool is lightweight and easy to carry, great accessory for cycling enthusiasts,you can choose the suitable one to match your bike. Specifications: Material: Brass Color: Blue Size: as the picture shows Package Included: 1 x Valve Disassemble Tool 10 x Presta Valve Core How to use Use a medium-sized wrench for Presta valve expansion. Use the larger end for the Presta spool. Use the small end for the Schrader spool.