Ball Bearings are one of the most important components in a Router Bit's structure since they have a direct impact on design and performance. Dimar's Deep Groove Ball Bearings have shields installed on both sides and are factory-packed with lubricants. It eliminates the need for relubrication and therefore, reduces maintenance costs.
Dimar BB-XX Series Ball Bearing.
O.D.= Outside Diameter
I.D.= Inside Diameter