ITEM NAME:100pcs 12mm Tire Anti-slip Screw Stud Wheel Tyre Lugs Snow Nail Tire Spikes R9L7 100pcs 12mm Tire Anti-slip Screw Stud Wheel Tyre Lugs Snow Nail Tire Spikes R9L7 The new style screw in tire studs can be easily installed and removed without professional tools, it can also be disassembled according to the reason, When not in use, it could be removed lightly and stored for using again in th following season. This kind of screws are suitable for most of tires and add ultimate off-road capacity to your ordinary ATV, UTV or 4X4 vehicles. It brings a good anti-slip property for your tires. Made of hard metal, these kind of tire stud screws are strong and durable in use. It has a low ground pressure and it is environmentally with minimum impact. It is easy to install with certain drill and can match well with your vehicle tires. Please choose appropriate size of new studs in the installation process in.Drill down (using a very small point) into the tire from the center of the selected knob. It brings a good anti-slip property for your tires. Drill a screw from inside to outside. If the angle is not perpendicular to the tire, one or the other side will protrude.