Pro Jewelry .925 Sterling Silver "United States Air Force" Charm Bead for Snake Chain Charm Bracelets Quantity: 1 Bead Size:Hole is 4.5mm Material: S925 Solid Silver Single slide on Core (not threaded) Fits: All major Brand Bracelets, such as Pandora, Troll, Chamilia, Kay, Carlo Biagi, Zable, and other add-a-bead bracelets.