I'm sorry, but I see that I should have been more clear. I was not thinking about splittig wedges, but I see how what I wrote could have been interpreted as that. BTW --- good advice about splitting wedges. I'll keep that in mind.
What I was meaning was the round metal wedges used to secure an axe, maul, hammer, etc., head. They are not near as popular as the "regular" metal wedges and I was wondering if they were an improvement or just a different style? Also was wondering if when installing a new handle and the wooden wedge seems to tighten the head up OK, is an additional metal wedge needed? I guess it is obvious that I have never changed out a handle before. I have an 8 lb. sledge hammer head that I need to install a handle on. Got the old one out already. It has an eye size of 1"x1.25". Any advise would be appreciated. THANKS!