Brass Grade B Rhinestone Spacer Beads, Wavy Edge, Rondelle, Silver, CrystalSize: about 5mm in diameter, 2.5mm thick; hole: 1mmThese are exceptional design elements used for holding multiple necklace or bracelet strands. Parallel multiple holes can be used as links or single to multiple strand transition pieces aaccording your design inspiration. Rhinestones are grade B.