10-Pack 6001ZZ 12x28x8mm Shielded on Both Sides Ball Bearing6001ZZ Shielded Ball Bearings 12mm x 28mm x 8mm Lot of 10 Bearings 6001ZZ Shielded Ball Bearings, Bearing inner diameter is 12mm, Bearing outer diameter is 28mm and Bearing width is 8mm, Made from high strength chrome steel for durability and performance, each Comes with double metal shields (ZZ) to keep out dust and dirt, also bearings are prelubricated with grease, Bearings are packed 10 bearings in one plastic tube. 6001ZZ Ball Bearings Deep Groove