1The stainless steel replacement foot spikes can be screwed into the threaded 3/8inch -16 holes at the ends of the tripod legs.2These foot spikes allow the tripod leg dig deep into soft surfaces of the terrain to establish a stable footing with the ground while on softer, looser terrain.3The universal 3/8inch -16 stud at the top allows you to use them with any brand that uses the standard 3/8inch -16 thread.4Compatible For , , Siri, and other tripods standard 3/8 inch threaded tripod foot and/or monopod foot.5They're an Perfect way to keep your tripod stable while on softer, looser ground such as snow, sand, soft earth, gravel, and other loose surfaces. They're also useful on carpeting. Tighten the spike foot into place by using a wrenchcolour: silverMaterial: stainless steelSize: 80MMPackage Contents:3 x Stainless Steel Tripod Foot NailsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.