Flanged Bearing Sealed 5x8x2.5mm Miniature 5mm Bore5 x 8 x 2. 5 Flanged Ball Bearing One Bearing 5 x 8 x 2. 5 Flanged Ball Bearing, each bearing is rubber sealed from both sides to protect the bearing from dust or any possible contamination, plus its pre lubricated with grease so its ready to roll right away. 5 x 8 x 2. 5 Flanged Ball Bearing Deep Groove Ball Bearing Size: 5mm x 8mm x 2. 5mm Bearing Inner Diameter: 5mm Bearing Outer Diameter: 8mm Bearing Width: 2. 5mm Balls: Ceramic Closures: Two