The TA-3-FRC Pod Foot Rock Claw from Really Right Stuff is a machined stainless-steel foot with scalloped, sharp-edged claws. Therefore, it is ideal to use on uneven rocky terrain, which digs into the ground and keeps a good grip. The 3/8"-16 male thread is compatible with all RRS tripods and monopods. Also, with the supplied O-rings, it prevents the claw from loosening and falling out from the tripod leg. In addition, the claw can be used as a spare or as a replacement for the tripod's original rubber foot.