What are Replacement Running Spikes with Spanner
- 9mm? Replacement screw-in spikes for track & cross country running shoes. Heat tested for maximum durability. When can I use them? Designed to be utilized on all surfaces: Asphalt, Synthetic & Natural. Recommended for: Track running events, especially sprinting Field events eg. high jump, long jump javelin Cross country running Size 9mm Also available in 12mm size.