The Kilner Preserve Sealing Disc replacements are designed to fit onto Kilner Preserving Jars. The current sizes available are 0.25, 0.5 and 1 litre capacities. They are to be used in conjunction with the Kilner Preserve Screw Bands to create a perfect vacuum seal which will become airtight and leak proof, ensuring the contents are kept fresher for longer. Made from quality tin metal, perfect for all preserving requirements. Hand wash and dry straight away. Measuring 7cm in diameter.