ITEM NAME:Bobbin Case For Singer 20u Zig Zag Lockstitch Sewing Machine No mm 8.5 Back R7T5 description: 100% high quality Can be used for other industrial sewing machine bobbin cases. This bobbin case cannot accommodate domestic sewing machines. No reflection at all Metric size: Bobbins suitable for these bobbin sizes: 21.0 mm wide and 8.5 mm thick. material: metal Color: Silver Packaging: 1pc A.Can be used for other industrial sewing machine bobbin cases. No reflection at all.