A set of a valve core tool and 8 valve cores!! Using the valve core tool, you can quickly install and remove tire valves! This is an easy-to-use valve core set. When replacing valve cores, the tire will lose air, so please remove the tire (wheel) or jack up the vehicle before working. Can be used for cars, trucks, bicycles, and motorcycles. When repairing a tire, you can use a wrench to remove the valve core, release the remaining air in the inner tube, and easily remove the tire bead.