2 Copper Tweezers Jewelers Pickling Acid Soldering Tools. This is a new set of 2 pairs of copper tweezers. These are used with pickling solutions. You receive: One pair of fishtail copper tweezers that measure approximately 8 1/2" (215 mm) long. One pair of curved copper tweezers that measure approximately 8 1/2" (215 mm) long. We work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.