... 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”)152.4mm( ... ”)311.1(12 1/4”),346.0 (13 5/8”),349.2(13 3/4”)374.6(14 3/4”)381( ... 15”),393.7(15 1/2”),406.4(16”)444.5( ...