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- (1) ATB 671-18 Internal diameter 68 mm - width at top 7 mm - weight 22.5 gm £14
(2) ATB 671-18a Internal diameter 63 mm - width at top 6 mm - weight 16.5 gm £12 (3) ATB 671-18b Internal diameter 65 mm - width at top 6 mm - weight 14.5 gm £12 (4) ATB 671-18c Internal diameter 61 mm - width at top 6 mm - weight 15.5 gm £12 -
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