This is a set of 3 removable rubber suction cup feet with retractable stainless steel spikes for manfrotto tripods with a 16mm diameter lower leg section including the 190xb 190xdb 190xprob 190cx3 190cxpro3 and 055cxpro4 as a replacement for the original rubber feet the manfrotto 160 sck3 set has been designed to increase the foot area of the tripod and therefore offer improved stability on softer ground such as grass