This tool small, handy tool designed to remove and install valve cores is versatile and practical for cyclists or anyone working with valve cores. Its ability to handle both Schrader and Presta valve cores makes it adaptable to various types of bikes and equipment. The additional functionality to remove and install Presta valve extenders with 5mm wrench flats adds extra value. However, it's important to note the disclaimer about Presta valve cores, as not all of them are removable. This caution helps users avoid potential damage to their equipment. Overall, this tool is perfect for anyone needing to work with valve cores.