Easy to match with most of the track shoes, improve your running balance of traction, flexibility and speed. Fits Size:6.35 mm (1/4 inch) in length, tapered and needle-shaped, which increases friction between the sole and the ground and prevents skidding,especially suit for track sprints, long jump,running, outdoor sports activities. Premium Quality:These shoe spikes replacemen are made of quality steel, durable and rust-resist and anti-corrode, ensure you to use for a long time.. Easy to Use:The included spike wrench tool helps you easily screw the track spike into the sole of your sneaker. Spikes are packaged in a reusable transparent box for easy portability. Strong Practicability:If you like running, climbing, or you are a sports enthusiast, this track spikes will help you a lot. This pyramid spikes will add the friction between the shoe sole and ground, thus can resist skid and improve your running speed. Colour:Black Material:Carbon steel Package Contents: 56 * Spiked Nails 1 * Nail Remover 1 * Box