PACKAGE: You will receive 12 starting block spikes, providing ample quantity for replacing old or broken spikes. DURABLE: These track starting block spikes are made of 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 grip and stability during use, making them 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 gift for family, friends, colleagues, or anyone who enjoys sports. Specification: Material: Steel Size Chart: Thread diameter 0.48cm/0.19inch Nail tip length 1.12cm/0.44inch Package Includes: 12 Starting Block Spikes (2 Pack) Note: Please allow slight variations due to manual measurement and differences in monitor displays.