I saw in one of your earlier post you said you had a surplus of rr spikes. Look on the head of the spike to see if it has "HC" marked on it. The "HC" stands for high carbon. It has enough points of carbon to harden and take an edge. While there is definitely better steals to use, this is as good of place to start as any since you have them in surplus. You can also make knives from these spikes as well. Good luck and hope this helps