The iCheckTPMS emergency tyre repair plugs are a simple and effective repair method for repairing small nail and screw repairs without having to remove your wheel from the vehicle. Coming in two sizes in the kit you can repair holes of up to 5mm in diameter. Simply remove the foreign object and screw the repair plug so it is flush or just below the tyre surface. The screw plugs are made of a flexible hard plastic with the addition of a rubber compound on the outer surface making for an instant repair.