I found these two identical items on a New England beach about 200 feet apart. They are non-ferrous, roughly 1.45" long and 0.3" diameter. The white end is plastic. The opposite end is is threaded and the insert appears to be silver plated. The body appears to be nickel plated. There is a small hole in each end. They are definitely precision made. One did have remnants of a label but nothing that could be read. Anyone know what they are.