I just recently bought a tack hammer and the first thing the wife asked was, (why is one end split)well after stuttering for a couple minutes i told her the reason it was split (in my opinion and the only answer i could come up with real fast) was to hold a small tack while you nailed it, her next question was (well if the hammer is holding the tack what do you use to hammer the tack?) I said oh that reminds me i need 2 of these i better run back and get another LOL. Ok i knew something wasnt right about the split so i did some research, To my amazement i found out why it is split, most tack hammers have a magnetic end to hold a tack or to pick up a tack (this i knew but had no idea the split was the reason) the split on one end can enable the magnet to have both poles north and south close together for a more powerful holding capacity and also keep the opposite end (nailing end) to be neautral, the split has many uses today and has evolved somewhat in different designs for different types of work, if anyone would like to research this it is very interesting, a patent was filed by Authur R Robertson on May 3, 1856 patent #352070 it was issued on Nov 2, 1886 for magnetic tack hammer, hope someone finds this as interesting as i did :gar-Bi