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6904-2RS Alternator Bearing 20x37x9mm Sealed nachi 7312BMU Glass fiber balls add extra6904 2RS AB Alternator Sealed Ball Bearing 20mm x 37mm x 9mm 6904 2RS AB alternator sealed ball bearing, measures an inner diameter of 20mm, outer diameter is 37mm and the width is 9mm, made from durable 52100 alloy steel, commonly known as chrome steel. 6904 2RS AB Ball Bearing Deep Groove Ball Bearing Material: Chrome Steel Closures: Rubber Seals Lubrication: Pre lubricated with grease Dimensions: 20mm x 37mm x 9mm Metric Inner Diameter: 20mm Outer