R1810ZZ 5/16x1/2x5/32 inch Chrome Steel Bearings Pack of 10R1810ZZ Shielded Ball Bearings 5 16" x 1 2" x 5 32" inch Lot of 10 Bearings R1810ZZ Shielded Ball Bearings, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, Bearing inner diameter is 5 16" Inch, Bearing outer diameter is 1 2" Inch and Bearing width is 5 32" Inch, also bearings are pre lubricated with grease. Item: R1810ZZ Ball Bearings Type: Deep Groove Ball Bearings Dimensions: 5 16" x 1 2" x 5 32" inch