For kit is perfect for quick repair of steel belted and radial tires. This kit is perfect for quick repair of steel belted radial and bias ply tires. It includes a tire repair rasp designed for repairing punctures and small damage to trailer tires such as those caused by nails or screws. It is an essential component of a tire repair kit used to prepare the puncture area for patching or plugging steel belted radial tires or bias-ply tires. This auto repair supplies kit also comes with a repair probe needle as well as rubber cement and 5 flexible and durable repair strings. Its portable design makes it a trucking essential to store in your vehicle in case an emergency repair is needed on radial tires or bias-play tires. Super simple to use.