RI-618ZZ Miniature Shielded Bearing 1/8x3/8x9/64 inchRI 618ZZ Shielded Miniature Bearing 1 8" x 3 8" x 9 64" inch RI 618 ZZ Chrome Steel Ball Bearing, the inner diameter is 1 8", outer diameter is 3 8" and the width is 9 64", this is a popular size that could be used in many applications, 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. Item: RI 618ZZ Ball Bearing Type: Deep Groove