Diameter Ø : 20
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BS7304, 9253840502, 9253840160, 9253840010, 0074203624, 4454107730
BS9404, 9254601000, 9254600340, 0184205518, 81504106820, 1935449, 1505440
BS3300, II38572F, 4231047100, 4231047150, 0064205224, 1932621, 1505241
BX7518, 9253712000, 9253761060, 0883547, 0879098, 1935390, 5021170324