PRICES MAY VARY. Versatile Clapper Sewing Tool: Ideal for tailors, craftsmen and quilters, the wooden clapper helps to flatten seams and leave a neat, sewing spaces where the iron is difficult to fit, thread ripping, crisp finish on your quilting projects. Easy to Use Sewing Supplies: To use the quilters clapper, press the seam with a hot iron and steam. Immediately after lifting the iron, place the clapper over the seam and hold it down until the fabric cools, finally help creases from fabric.