The manfrotto 160spk3 set consists of 3 rubbermetal spiked feet for tripods with a lower leg section diameter of 16mm the spike is made of a special hard anodised aluminium alloy extremely resistant to corrosion and the feet are supplied with a dedicated tool to make fixing and removal easier this set will fit the manfrotto 055cxpro4 190xb 190xdb 190xprob 190cx3 190cxpro3 190cxv3 and 055cxpro4 tripods