TierraCast® gold plated 9mm Celtic decorative washers for riveting. Great for leather! 3mm center holes are perfect for use with TierraCast rivets. Although these Celtic knot findings are designed as rivet accents, they are also excellent for small choker centerpieces, as well as links or connectors for a wide variety of Celtic jewelry designs. TierraCast uses lead-free Britannia casting alloy for cast pewter components.