Insert them at intervals while stringing beads.
Spacer beads are used to hold multiple necklace or bracelet strands of beads in alignment and to prevent tangling.Alloy Spacer Beads, Cadmium Free & Nickel Free & Lead Free, Rondelle, Antique SilverSize: about 10mm in diameter, 2mm thick, hole: 3mm. Alloy Spacer Beads.