It's a classic, hardwood pressing tool that's really two tools in one. The top, narrow-surfaced, point presser side works like a tiny ironing board for pressing hard-to-reach seams and enclosed corners, like those on collars, lapels, and cuffs.
A point presser is invaluable for pressing hard-to-reach seams. Slip the seam, wrong side up, over the point.
The clapper side is used to apply pressure to set permanent creases, form crisp edges, and flatten bulky seams. To use it, first apply steam to the area with your iron, then press with the clapper, leaning on it and applying as much pressure as possible. Hold this position until both the fabric and wood (which presses the steam into the area without adding heat) have cooled. "