Features: It can be gently removed and stored for future use. Low ground pressure, environmentally friendly and minimal impact. It can be installed on the soles to prevent slipping when walking on ice. Suitable for most tires, increase friction for car, trucks, motorcycles, and so on., and enhances extreme offs-road capabilities. You will receive 100pieces of carbides screw tire studs and installation tool , enough to satisfy your demands for daily use and replacement, you can store them for a long term use or share them with your family and friend. Specifications: Material:Steel Size:4x9mm,4x12mm Package Includes: 100Pcs Tire Studs 1Piece Installation Tool note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.