Scale nail / Nail

There are times when people only intend to pin the nail a little, but they do it too much because they fail to measure the strength. As a result, the nail is pinned so deep that it penetrates the whole board, which hurts the beauty and brings risks. This design, however, adds scale mark on the pin. Though it is nothing but a simple improvement, but it brings convenience to the pinning, for you can know full well how much you have been pinned and the strength and accuracy of the pinning. It is convenient to produce, cost-effective and easy to sell.