Gitzo G1220.129B3 Gitzo short spike and rubber foot, 30mm For Tripod (Set of 3) Comes In A Set Of 3 Rubber Foot is compatible with all Gitzo tripods with 3/8 threaded legs. The rubber foot is attached to the short spike like a cap, and can be pulled off when its time to use the spike. The resistant rubber material is highly stable, even on slippery floors. The diameter of the widest part of the rubber foot is 30mm