These Schrader/Presta valve core removal tools are proudly machined and manufactured by students at Roseville High School's engineering program. Manufactured and CNC machined from 6061 aluminum, these valve core removal tools are nice and compact and can fit into any small bike pouch for easy access. Can't remove the core with just your finger strength? No problem! Simply grab a 10mm wrench to add a little more torque and the valve core should come out with ease! Thank you for Supporting RHS Engineering!