PACKAGE: You will receive 12 pieces of starting block spikes, providing sufficient quantity for replacing old or broken spikes. DURABLE: Track starting block spikes are constructed from steel material, offering weather resistance and long-lasting durability. DIMENSIONS: The replacement sprinter pedal spikes feature an M4.8 thread, compatible with all standard domestic starting blocks, and are easy to install and replace. FEATURE: The stable design provides enhanced grip and stability during use, ideal for track and field equipment such as starting blocks and running aids. GREAT GIFT: These replacement studs are simple to use and quick to install, making them a practical choice for athletes and sports enthusiasts. Specification: Material: Steel Size Chart: Thread diameter 0.48 cm / 0.19 inch Nail tip length 1.12 cm / 0.44 inch Package Includes: 12 Starting Block Spikes (2 Pack) Note: Please allow slight variations due to manual measurement and differences in display monitors.