R6ZZ Shielded Ball Bearing 3/8" x 7/8" x 9/32" R6ZZ Shielded miniature Ball Bearing, this is a popular size that could be used in many applications, the inner diameter is 3/8" inch, outer diameter is 7/8" inch and the width is 9/32" inch, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearing is pre-lubricated with grease and bearing is made of Chrome Steel.