I turned a fat short baseball bat on the lathe one day. The fat end has a 4" diameter. The Bat is 14" long and the handle is a comfortable grip for swinging it. I keep it in my Big Truck and call it a tire thumper. But it will work just fine for a head thumper if need be. Made of some very hard and heavy wood a ran across but don't know what it is. I do thump my tires with it so it has lots of marks on it. I'm not allowed to Carry any sort of weapon in my job and I think that is crazy. I understand bullets and large amounts of fuel is not a good mix but when fuel was 6+ bucks a gallon I was feeling very vulnerable.
"Speak softly and carry a big stick." Theodore Roosevelt