6703ZZ Shielded Ball Bearings 17mm x 23mm x 4mm Lot of 10 Bearings 6703ZZ Shielded Ball Bearings, the inner diameter is 17mm, outer diameter is 23mm and the width is 4mm, 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.