●Convenient Tools": An innovative, small, multi-functional and useful tool designed to attach and remove valve cores from Schrader and Presta ●【Application】: This valve tool is a small and convenient tool. Used to remove and install spools and valve extenders. Used for mountain bikes, Dutch bikes, electric bikes, folding bikes, comfort bikes. Suitable for most bicycles ●Works with removable valves (all not removable) ●Compact design, CNC precision machining, aircraft aluminum ●Size: Approx. 2.1 x 0.4 x 0.4 inches (54 x