What is a wood clapper use for?

It is a hardwood pressing tool shaped to fit the hand and used to set permanent creases, form crisp edges and flatten bulky seams by pounding the seams while steaming them in tailoring. It is often sold as two tools in one. The top is a narrow-surfaced, point presser for pressing hard-to-reach seams and enclosed corners, like those on collars, lapels, and cuffs. The bottom, clapper side is leaned on or hammered onto the area you are applying steam to with an iron. Hold this or pound this area until cooled.