3 Stainless mandrels- 3/16 (4.75mm) x 9 inches long. Stainless Steel. Ideal for the Pandora bead inserts. Please click the blue "Devardi Glass" above to see all our listings. For Big Hole (Pandora Style) Beads. Heat the mandrels on the ends to burn off any oil residue from manufacturing. Allow to cool and apply your bead release as per instructions. Allow release to dry. You are ready to make your hot glass beads. :)