High Quality 10 Router Cutter Ball Bearings, the inner diameter is 1/4", outer diameter is 1/2" and the width is 3/16", each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.

• Item: Double Shielded Ball Bearings
• Type: Deep Groove Ball Bearings
• Closures: 2 Metal Shields
• Lubrication: Self Lubricated (Grease)
• Dimensions: 1/4" x 1/2" x 3/16" Inch
• ID (inner diameter)/Bore: 1/4 inch
• OD (outer diameter): 1/2 inch
• Width/Height/thickness: 3/16" inch
• Size: 1/4" x 1/2" x 3/16"
• Size: 0.25" x 0.5" x 0.1875"
• Size: 6.350mm x 12.70mm x 4.7625mm
• Quantity: 10 Bearings