ITEM NAME:100x 4*12mm Car Tire Stud Thorn Screw Anti-slip Snow Ice Nail Bit Accessories OZ Description: Application scenario: all kinds of cars, SUVs, snowmobiles, motorcycles, bicycles and other Can easily install and remove this new type of tire bolt without professional tools If it is not winter, it can also be removed from the tire. You can store these bolts for reuse next season. Installation: 1. Drill down (a very small point) from the center of the selected knob into the tire. 2. Drill a screw from the inside out. If the angle is not perpendicular to the tire, it will extend out on one or the other side. 3. Drill and tighten one hole at a time. Wrap the tape around the screw on the inside of the tire. Sometimes it is best to use two layers of tape. Note: 1. Please allow 1-3mm error due to manual measurement. Please make sure you don't mind.Drill down (a very small point) from the center of the selected knob into the tire. Wrap the tape around the screw on the inside of the tire. 100pcs nail. Can easily install and remove this new type of tire bolt without professional tools If it is not winter, it can also be removed from the tire.