The Manfrotto 116SPK3 Retractable Spiked Foot Set is an optional upgrade made to fit their "D16" tube, found upon the 190XB, 190XDB, 190XPROB, 190CX3, 190CXPRO3 & 055CXPRO4 tripods. The broad, tough spikes are made from a hard-wearing anodized aluminum alloy and will significantly increase stability on soft earth surfaces. Each spike's surrounded by a retractable hard rubber foot with tapered concentric circular rubber ridges that get smaller as they approach the ground surface.
Reviewed by 2 customers
It's nice having the option to switch between rubber and a spike just by screwing the rubber piece out. The rubber feet that come with this tripod (190CXPRO3) are simple rounded rubber caps that go over the open end of the carbon tube, you just pop them off (takes a bit of effort) and put these on, tightening them down with a screwdriver. They weight quite a bit more, the stock caps are probably only like a half-ounce each, so these wouldn't be good if you are counting ounces. I'm pretty sure they are also really overpriced, hence the 4 stars.
Safe operation of my tri-pod while its holding my expensive equipment.