Precision engineered for precise inflation of your Zipp wheels, these Zipp Tangente Valve Extenders take the hassle out of short Presta valves. - For use with threaded Presta (non-removable core) tubes - Knurled end to keep pump from slipping - Available in all lengths to match all Zipp wheels - 3mm hex broach in the barrel to guarantee a perfect seal when tightened