[Silversmith]

Are you interested in using them, say to cover roll bar holes? If so, you might consider looking at a electrical supply house. They carry products called "KO seals" or knock out seals. Wich are used to re-seal holes made in electrical panels. The higher quality seals come with threaded bolts welded to the center of the under side of the seal with a backing piece that sandwiches the two halves together & a wingnut; a gasket is also included. Be sure to say that you want stainless steel KO seals. These come in brushed stainless and are machine tappered on the top side & look great. Or they could be painted. They come in sizes from 1/2" to 4" Some electrical supply houses also offer the same style in mild steel. Grouse-Hinds is one brand, that makes this style.