On the bottom of the tungsten bullet-shaped sinkers is a stainless steel "corkscrew" device that makes it easy to thread on a plastic bait and hold it in place next to the weight, thus eliminating the need to peg the weight which can cause line damage. All of Bullet Weights Screw-In Weights include a plastic insert that is essential to prevent the line from twisting around the corkscrew (which can cut the line) when applying the bait or at hookset. Tungsten Screw-In Weights are available in Natural, Watermelon, Transparent Red, Transparent Purple and Black colors.