ITEM NAME:100Pcs 12mm Car SUV ATV Anti-Slip Screw Spin Wheel Socket Snow Tire Spikes Trim 100% brand new and high quality. Features: 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 a screw up from inside to out. If the angle isn't perpendicular to the tire, it will stick out one side or the other. Put duct tape over the screws on the inside of the tire. Drill (using a very small bit) down from the center of chosen knob into the tire.