These splined kingpins are nothing fancy – they’re just replacements for when you snap one. Most modern trucks can’t take traditional hex head kingpins now, so you have to make do with one of these instead.
We just hope you have a lump hammer handy to get the old one out!
(Aside: if your trucks can take a hex head, we highly recommend you use a traditional kingpin instead. They’re far less prone to wobble; a wobbly kingpin means a sloppy truck and an unstable carve.)