R156ZZ Ceramic Shielded Bearing 3/16" x 5/16" x 1/8" Bearing Bicycle Hybrid Ceramic Bearing outer diameter is 52mm and

outer diameter is 52mm and width is 15mm

5 Stainless Steel Ball Bearings

Static load rating Cor: 4

7003CYDUP4 Nachi Angular Ball Bearing

R156ZZ Ceramic Shielded Bearing 3/16" x 5/16" x 1/8" Bearing Bicycle Hybrid Ceramic Bearing outer diameter is 52mm andR156ZZ Shielded Ball Bearing With Ceramic Balls 3 16" x 5 16" x 1 8" inch R156ZZ Shielded Ball Bearing with Ceramic Balls, a standard bearing size with dimensions commonly used across many industries: 3 16" x 5 16" x 1 8". each Comes with double metal shields (ZZ) to keep out dust and dirt. R156ZZ Ball Bearing Deep Groove Ball Bearing Balls: Ceramic Shield Double Metal Shields for dust protection (ZZ) Lubrication: Pre lubricated with grease Inner