6001ZZ 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, Bearings are made of Chrome Steel, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease, Bearings are packed 10 bearings in one plastic tube.