Kilner Wide Mouth Seals Set 12 The Kilner® Wide Mouth Sealing Disc replacements are designed to fit onto Kilner® Wide Mouth Jars. The current sizes available are 0.2, 0.35 and 0.5 litre capacities. They are to be used in conjunction with the Kilner® Wide Mouth 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. Hand wash and dry straight away. Measuring 9.5cm in diameter. Set contains: 12 x Sealing Discs