636ZZ Shielded Ball Bearing 6mm x 22mm x 7mm One Ball Bearing 636ZZ Shielded Ball Bearing, Bearing inner diameter is 6mm, Bearing outer diameter is 22mm and Bearing width is 7mm, 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.