6904LU Sealed Ball Bearing20mm x 37mm x 9mm 6904LU sealed ball bearing, the inner diameter is 20mm, outer diameter is 37mm and the width is 9mm, Bearing is made of Chrome Steel. Item: 6904-DU Ball Bearing Type: Deep Groove Ball Bearing Material: Chrome Steel Closures: Rubber Seals Lubrication: Self Lubricated (Grease) Dimensions: 20mm x 37mm x 9mm/Metric Inner Diameter: 20mm Outer Diameter: 37mm Width: 9mm Size: 20 x 37 x 9 mm Quantity: One Bearing