Occasionally I like to stop along the highway and see what goodies have flown off passing vehicles. Recently I found two large ball bearing sets. Immediately I'm seeing knives. I cut off the outer races, obvious blade material. But when I saw the balls, I thought, why not try them. I decided to leave them in their little bracket for ease of forging, and that worked well. I found out this steel (52100) doesn't like to be hammered after it loses a good heat... So I ended up with some blades from several of the balls. Heat treating went well. Next I'll start putting handles on them.