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6904DDU 20x37x9 Sealed Ball Bearing one piece bearing ✅ Type: Square Flange Linear6904DDU Sealed Ball Bearing 20mm x 37mm x 9mm 6904DDU 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. 6904DDU 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 Diameter: 37mm Width: 9mm Size: 20