Suitable for outdoor and indoor use 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 The rubber tripod feet spikes replacements fit all tripods and monopods with 1/4inch thread mounting Each tripod spikes foot is selected from silicone rubber, which have grip to tripods and monopods slip and provide stability even if in uneven terrain Just simply screw it in and then use it on your tripod