Diameter Ø : 20
BS3547, 4231067000, 4235060810, 81511016467, 81511016483, 20708819, 1542893
4231069000, 0004207524, 81511016115, 1010154, 6212188, 834483
BS9404, 9254601000, 9254600340, 0184205518, 81504106820, 1935449, 1505440
BZ1400
O 302
BZ6621, 4253250610, 81504106118, 81504106125, 81504106160, 81504106217, 5000560850