Ultra-stable big feet (diameter 50mm) for solid footing and maximum stability on any surface, from slippery floors to soft sand. The integrated ball allows the rubber to have full contact with the ground regardless of the leg angle. When used on monopods, the ball provides smooth movement, making it easier to follow moving subjects. Compatible with all Gitzo monopods with 3/8” threads on the leg ends.\nGSF50M replaces G1220.130B and G1410.130B.