Panel Beating Hammer I Can't See A Maker 3.75"Head. The square section of the head has a total diameter of 1.25 inches and the round section of the hammerhead has a diameter of an inch and an eighth. Hickory handle with no faults. Head is very securely fastened onto the body. Total length of the head and the handle is 11.5 inches or 29.5 centimeters.