1.The stainless steel replacement foot spikes can be screwed into the threaded 3/8inch -16 holes at the ends of the tripod legs. 2.These 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. 3.The universal 3/8inch -16 stud at the top allows you to use with any brand that uses the standard 3/8inch -16 thread. 4.Compatible For , , Siri, and other tripods standard 3/8 inch threaded tripod foot and/or monopod foot. 5.They'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 foot into place by using a wrench colour: silver Material: stainless steel Size: 80MM Package Contents: 3 x Stainless Steel Tripod Foot Nails Only 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.