Usage Tips:【Reliable Construction】: Made from wear resistant hard steel, these spikes are designed to withstand frequent use without easily wearing down, ensuring long term performance for your track shoes 【Enhanced Traction】: The track shoes spikes provide grip on various surfaces, making them ideal for improving skills and speed during sprints and regular training sessions 【Versatile Use】: greatly suited for synthetic tracks and short distance sprints ranging from 100 to 400 meters, these spikes cater to both competitive and everyday practice needs 【Comprehensive Set】: This package includes 50 track spikes along with a convenient wrench, allowing for easy installation and removal of spikes as needed 【Optimal Size】: Featuring spikes thread size of 5 mm and a wrench size of 8cmx5.4cm/3.15inchx2.13inch, this set is designed to fit most standard track shoes seamlessly, providing a secure fit for enhanced performance Specification: Material: Steel Plastic Size Chart: Spikes Thread 0.5cm/0.20inch; Wrench 8cmx5.4cm/3.15inchx2.13inch Package Includes: 50 Track Spikes 1 Wrench 1 Storage Box Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.