Quality Material: Made of quality stainless steel, which is very sturdy, rust-resist and anti-corrode. Pyramid needle design, not damage track. Very practical items for both men and women. Package Includes: Package includes 20 pieces spikes with 1pcs spike wrench, convenient for you to replace your shoe spikes. There are enough quantity for your daily use. 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. Easy to Use & Replace Spikes: The package includes a spike wrench. It is very easy for you to screw the track spikes into the shoes, convenient to replace the spikes. Ideal for athletic tracks, field and cross country surfaces. Provide Great Drip for Sportsman: The spike pins can increase the friction between the shoe sole and ground, resist skid and improve your running balance of traction, flexibility and speed for track sprints, long jump, running. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store