Nail Punch Set Neatly countersinks finishing nails just below wood surfaces for a finished look. The nail center punch set has three size, there are 1 pc 2.5mm center punch, 1 pc 3mm center punch and 1 pc 4mm center punch. Usually used for positioning and marking before drilling hole. Determine the center of the hole to be drilled to prevent misalignment. The nail setter punch tools are appropriate for various surfaces, such as wood, aluminum, brick walls, plastic surfaces, glass windows and so on.