6918ZZ Shielded Ball Bearing 90 x 125 x 18 mm One Bearing 6918ZZ Shielded Ball Bearing, 6918ZZ Bearing is a popular item that could be used in many applications that uses this size 90mm x 125mm x 18mm, this 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.