TYRE SHIELD seals holes in tubeless tyres caused by puncturing objects up to 6 mm in diameter which appear in the tread area of the tyre and 3mm in tube tyres as the vehicle is being driven. TYRE SHIELD prevents punctures on all pneumatic tyres from cars, trucks, diggers, telescopic handlers etc. TYRE SHIELD Prevents: Rust Heat Build Up Sealed Porous Leaks Maintains Tyre Pressure TYRE SHIELD™ The Life Blood of your Tyres .