208SF Shielded 40mm x 80mm x 18mm Bearing208SF Shielded Ball Bearing 40mm x 80mm x 18mm One Bearing 208SF Shielded Ball Bearing, Bearing inner diameter is 40mm, Bearing outer diameter is 80mm and Bearing width is 18mm, 208SF made from durable 52100 alloy steel, commonly known as chrome steel, has 2 Metal Shields to protect the bearing from dust or any possible contamination, 208SF bearing is pre lubricated with grease. 208 SF Ball Bearing Deep Groove Ball Bearing Dimensions: 40mm x 80mm x