Feature: Specification: Features: Made of hard metal alloy, super strong and durable. Easy to install with certain drill, can match well with vehicle tires. Can be lightly removed and stored for next use. Low ground pressure and environmental friendly with minimum impact. Fits for most tires and adds ultimate off-road capacity to car, truck, motorcycles, etc. Note: Please choose appropriate size of new studs in the installation process in terms of the depth of tire thread. Installation: Drill (using a very small bit) down from the center of chosen knob into the tire. 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. Do one hole and screw at a time. Put duct tape over the screws on the inside of the tire. Sometimes it is best to use two layers of tape. Specifications: Material: Steel Alloy Color: Silver Quantity: 100 Pcs Package Size: 7x6x2cm or 2.76x2.4x0.8inch Package Weight: 50g or 1.76oz Package List: 100 x Tire Stud Screws Package List: 100 x Tire Stud Screws