Leather working fitting hammers are used mostly for hammering seams and for flattening leather pieces. They look like a hammer head, without a wooden handle. They are made of steel, and the piece in between the two heads is where it is held. One end is generally rectangular, narrow, and flat. The other end is usually round, wider, and flat. If one pound seams often and likes the feel of this handle style over a typical hammer, the fitting hammer might be a helpful leather working tool addition.