Top mounted router bit bearings, interior diameter: 3/16Inch, outer diameter: 3/8Inch 10PCS Router bit Bearing Replacement Set Containing bearings, set screws, lock ring, and hex key wrenches.router bits bearing replacement sets are made with Premium Metal Use the bearings to repair your router bits if the top bearing in your router bit is broken.With the bearings, create a different depths or widths groove in the board. Made of high quality carbide steel, please wear gloves for service life when using.Deep groove geometry for supporting both and axial loads and high speeds. Use the bearings to repair your router bits if the bearing in your router bit is broken.Replace or repair the damaged or lost router bit bearings Material: Metal colour: silver Package Contents: 1 set Slotted drill bits (accessories as shown) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.