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6304-2RSN Sealed 20x52x15mm Grooved Ball Bearing Inner Diameter - 90mm Dimensions d D B r6304 2RSN Sealed Grooved Ball Bearing 20mm x 52mm x 15mm One Bearing 6304 2RSN Sealed Grooved Ball Bearing, measures an inner diameter of 20mm, outer diameter is 52mm and the width is 15mm. The bearing is equipped with two rubber seals to shield against dust and contaminants plus its pre lubricated with grease so its ready to roll right away. 6304 2RSN Ball Bearing Grooved Ball Bearing Closures: Two Rubber Seals Lubrication: Pre lubricated with grease