If you have an old chainsaw blade that can no longer be used on your chain saw you can drill out all the rivets and have three pieces left. throw the center piece away and fashion the outside sections into knives. I just finished making a machete out of most of one side and a skinning knife out of 4 inches of the tip of the other side. the metal is 1/16 thick and pretty hard. a file will have a hard time to sharpen it I used a 4 inch grinder to cut it out and also to ruff grind it and used a water wheel to finish them then used aluminum rivits for the handle. I have part of one blade left and may try a fillet knife. Something to pass a winter afternoon.