R12ZZ Shielded Ball Bearings 3/4" x 1 5/8" x 7/16" Lot of R12ZZ Bearings Lot of R12ZZ Shielded Ball Bearings, R12ZZ is a popular size that could be used in many applications, R12ZZ Bearings are made of Chrome Steel each R12ZZ bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also R12ZZ bearings are pre-lubricated with grease, Bearings R12ZZ are packed 10 bearings in one plastic tube.