This Stainless Steel Spike from Feisol is a spike designed for the Feisol CM-1471 monopod and is compatible with the CT-3371 and CT-3471 tripods as well (three spikes required for a tripod). The 2" spike gives greatly improved support on soft wilderness terrain including sand, snow, and grassland, and is also suitable for hard surfaces such as concrete and asphalt. The spike retracts into a rubber foot for indoor use.