Thank you for viewing! These are conchos made from American 10-cent coins. Screw size: 6mm. Set of 5. Diameter: Approximately 17.91mm Coin thickness: Approximately 1.35mm Smoked finish. The coin is slightly smaller than a one-yen coin. How about using them for leathercraft or as a decorative accent? If you would like to specify the number, change the screws or rings, or leave more of the black finish, please comment before purchasing. I will adjust the price and create them accordingly. If I have them in stock, I can ship them immediately, but it may take about a week. Thank you for your understanding.