10-Pack 4x8mm Shielded on Both Sides 4x8x3mm Miniature Bearing Ball Diameter - 1/16 inch (0.0625") the NU308MY inner diameter is

the NU308MY inner diameter is 40mm

the 29344E inner diameter is 220mm

Size: 1/4" x 13

N209EG Bearing

10-Pack 4x8mm Shielded on Both Sides 4x8x3mm Miniature Bearing Ball Diameter - 1/16 inch (0.0625") the NU308MY inner diameter isMR84ZZ Shielded Ball Bearings 4mm x 8mm x 3mm MR84ZZ Shielded Ball Bearings, measures an inner diameter of 4mm, outer diameter is 8mm and the width is 3mm, Made from high strength chrome steel for durability and performance, each bearing has Double Shielded to protect the bearing from dust or any possible contamination. MR84ZZ Ball Bearings Deep Groove Ball Bearings Shields: Double Shielded Lubrication: Pre lubricated with grease Dimensions: 4mm x 8mm