Improve Safety and Speed: This stud will increase the friction between the sole and the ground, which can prevent slippage, ensure your safety, and increase your running speed. Wide Range of Uses: very suitable for track and field,off-road roads,hiking,high jumping,or cross country. Lightweight and Portable: The package includes 100 nail replacement spikes and a nail wrench. It is very easy to screw the track studs into the shoes, and it is convenient to replace the studs and the box to carry. High-quality Material: This shoe stud is made of high-quality stainless steel, strong and durable, not easy to deform, rust-proof, anti-corrosion, and durable for long-term use. Size: The length of each stud is 1/4 inch (6.35 mm),a common size used in most running shoes.