Features:This kind of screws are suitable for most of tires and add off-road capacity to your ordinary ATV, UTV or 4x4 vehicles. It brings a good anti-slip property for your tiresMade of hard metal, these kind of tire stud screws are strong and durable in useIt has a low ground pressure and it is environmentally with minimum impactIt is easy to install with certain drill and can match well with your vehicle tiresPlease choose appropriate size of new studs in the installation process in terms of the depth of tire threadInstallation:1. Drill (using a very small bit) down from the center of chosen knob into the tire.2. Drill a screw up from inside to out. If the angle isn'for t perpendicular to the tire, it will out one side or the other.3. Do one hole and screw at a for . Put duct tape over the screws on the inside of the tire. Sometimes it is best to use two layers of tape. Note: It is easy to install, but professional installation is highly recommended.Specifications:Material: MetalColor: SilverOverall Length: 12mm/0.47"Outer Diameter: 4mm/0.16"Inner Diameter: 2mm/0.079"Quantity: 1 Set/100 Pcs+1 Pc M4 SleeveNote:Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bidDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you No Retail PackagePackage Contents:100 x Anti-Slip Screw1 x M4 Sleeve