Flanged Shielded Bearing 3.1x6x2.5 Miniature3. 1 x 6 x 2. 5 Flanged Shielded Ball Bearing One Bearing 3. 1 x 6 x 2. 5 Flanged Shielded Ball Bearing, Bearing is made of Chrome Steel, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearing is pre lubricated with grease. Item: 3. 1 x 6 x 2. 5 Flanged Ball Bearing Type: Deep Groove Ball Bearing Closures: 2 Metal Shields Lubrication: Self Lubricated (Grease) Size: 3. 1mm x 6mm x 2. 5mm Inner