were these tweezers. All 4 had used a little ridge within the areas to keep. It said grind first. In 2 of these tweezers, the surfaces were wrong about each other, so I can not use this for my model. Fortunately, however, was just the cranked very good because you need just the ships together build the most. The price is good, but who really needs tweezers for micro parts, but should invest a few more euros and buy Tweezers with better quality.
