This item is Multi-function valve core remover tool,fits for presta & schrader valve stem core and presta valve extender. >>>>The smaller end is for bike and car schrader valve core.>>>>Use the middle wrench for presta valve extender. >>>>The bigger end is for Presta valve core.>>>>CNC-machined tool easily removes both Presta and Schrader valve cores>>Universal Compatible with all Schrader & presta Valve Stems.