Common nails are made of iron, (or of mild steel in this case you must anneal them when you feel they are getting harder to hammer) ; any nail, around 3 inches long, can be turned into a small knife. Old bent nails cost nothing so you can try and make different shapes at no cost. Annealing means bringing the steel to a red-heath temperature and letting it air-cool.
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Put you in my gift guide for guys! Just thought I'd let you know :)
Dave
I am a professional blacksmith and have much experience with RR spike knives...
Dave
Try putting the HC spikes in a bath of white vinegar. It will take the rust off of the spike-all of it. The spike will look brand new!. Leave it covered by the vinegar for 2
or 3 days. Any longer and the spike will start pitting. Good luck! Mike
Don't breathe over your forge or flame (with or without nails in it).