Each tripod spikes foot is selected from silicone rubber, which have grip to tripods and monopods slip and provide stability even in uneven terrain Suitable for outdoor and indoor use The rubber tripod feet spikes replacements fit all tripods and monopods with 1 / 4inch thread mounting Just simply screw it in and then use it on your tripod The tripod feet spikes allows the tripod leg to dig deeping into soft surfaces, and keep your tripod stable when you ' re shoots on softer looser ground such as snow, sand