I just read a news item about a guy in northern Maine who was splitting wood with a steel splitting wedge and a sledge hammer. Part of the wedge let go when he hit it with the sledge, sending it into his femoral artery and him to the morgue. Hitting steel with steel is dangerous. I never use splitting wedges, but if you do, be sure to grind off all the mushroomed steel that forms over time around the head. And by all means, always wear safety glasses.