6908ZZ Shielded Ball Bearing 40mm x 62mm x 12mm One Bearing 6908ZZ Shielded Ball Bearing, inner diameter is 40mm, outer diameter is 62mm and the width is 12mm, Bearings are made of Chrome Steel, bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearing is pre-lubricated with grease.