Flask Base is also known by the name of the cork ring and is suitable for supporting round-bottom flasks. Quality cork rings with well-sanded voids Perfectly parallel sides with concentric bores All rings have a height of 30 mm with an inside edge bevelled finish Made available in several sizes and finish grades Ring quality is carefully selected & segregated for meeting strictly defined standards Applications :Used for supporting – Round-bottom flasks Dishes Technical Specification: Item Code Fits Flasks ID (mm) OD (mm) CR001 5 to 100 ml 30 60 CR002 200 to 500 ml 60 100 CR003 1,000 to 3,000 ml 90 140 CR004 5,000 ml 120 170 CR005 12,000 ml 150 210 Material: Natural Packing: 1 Pc/Pk.