1/4inch = 6.35mm
5/8inch = 15.88mm
0.196inch = 5mm
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Product DescriptionR4 Imperial Open Ball Bearing
As open bearings do not have seals or shields, this allows grease to flow freely through the bearing for lubrication purposes. Bearings that are made in inches are really useful to match previous British machines and present American ones with the right bearings.