... rubber o-rin provides adequate sealing for bearing durability .5.size and model we can provide: 60mm,65mm,76mm ... ,120mm,127mm(5”)130.1mm(5 1/8”),133.3mm(5 1/4”),139.7mm(5 1/2”),142.8mm(5 5/8”),149 ... .2mm(5 7/8”)152. ... ”),250.8(9 7/8”)269.8(10 5/8”),295.3(11 5/8”)311.1(12 1/4”),346. ... 381(15”),393.7(15 1/2”),406.4(16”)444.5(17 1/2”),508(20”),558(22”),609. ...