LR604NPPU Track Roller 1 Row Bearing 4x13x4 Sealed Track BearingsLR604NPPU Track Roller Single Row Ball Bearing 4mm x 13mm x 4mm One Bearing LR604NPPU Track Roller Single Row Bearing, bearing is a Sealed, Bearing inner diameter is 4mm, Bearing outer diameter is 13mm and Bearing width is 4mm. Item: LR604NPPU Bearing Type: Track Roller Single Row Bearing Size: 4mm x 13mm x 4mm Bearing Inner Diameter: 4mm Bearing Outer Diameter: 13mm Bearing Width: 4mm Quantity: One Bearing