These are quite expensive for only 25 pieces. If they are like the originals they wear out quickly. The edge that provides the grip and traction rounds over in short order. When this happens you can slide a little on ice-still better than nothing. The threads are machined with a sloppy fit so they may back out and be lost. I would recommend putting a drop of Loctite threadlocker (Blue) on them when installing.  A carbide pin similar to what Kahtoola uses would seem like a better functional choice but then StabilIcer's would loose all that replacement profit. If you do a lot of hiking that sometimes involves dry ground plan on replacing several times a season.