Sold individually, this large "knife edge" hinge post has a 5/16" threaded shaft and uses a phillips head screwdriver to drive into place. It screws into a 9470 Large Post Anchor. It's thicker with more mass and sustain than the standard post.
Fits Kahler 2500/2520 Traditional, 2710 Killer (2700 Series) and 2720 Spyder tremolos.
Posts come in 2 sizes, depending on which mounting option was used to mount your bridge, you may need the 9486 Standard Post instead which has a 3/16" threaded shaft. For a short time in the early 80's, phillips head, bubble necked posts were made. The standard post would be the correct replacement for that type of post.