Buckingham replaceable dowel and screw style gaffs. If your climbing spikes were purchased after January of 2011, then your spikes will need these replacement gaffs.
Buckingham climbers purchased before 2007, use the pin style fasteners, item CL-9306.
Buckingham climbers purchased between 2007 and January 2011, use the screw style gaffs, item CL-9306T.