10-Pack R1810ZZ 5/16" x 1/2" x 5/32" Chrome Steel BearingsR1810ZZ Shielded Ball Bearings 5 16" x 1 2" x 5 32" inch Lot of 10 Bearings R1810ZZ Shielded Ball Bearings, each Comes with double metal shields (ZZ) to keep out dust and dirt, Bearing inner diameter is 5 16" Inch, Bearing outer diameter is 1 2" Inch and Bearing width is 5 32" Inch, additionally, these bearings come pre lubricated with grease for smooth operation. R1810ZZ Ball Bearings Deep Groove Ball Bearings Dimensions: 5 16" x 1 2" x 5 32" inch