This double-ended aluminium implement is perfectly sized for taking out & putting back your valve cores when carrying out essential tube maintenance, such as applying puncture sealant. The thinner end is suitable for use on Presta and Schrader inner tube valves, fitting snugly on to the valve core's head for easy unthreading from the tube & tightening back into it to finish the job. The wider end of the tool is suited for the same use on tubeless setups, which have a larger head-part & therefore require the enlarged fitment. In the middle of the tool is a special 5mm flat wrench engagement notch which will also let you remove valve extenders, making for a handy & versatile tool for getting the best from your tyres.