The Reactor kingpin is a hollow, top mounting pin. That means that because it is not solid, it is slightly lighter than the Revenge kingpin. The two pins are fully interchangable, the Revenge pin offers more strength, the Reactor offers less weight. Because the pin is screwed directly into the plate, you do not need to order a mounting kit unless you want to remount your plates.
Sold in a Pair of 2
Please be aware that these kingpins have been known to loosen themselves at the base, so if you have them, keep an eye on them and check them at each training.