These are the same high quality industrial bearings that come as original equipment on Whiteside's bearing mounted router bits Use them to replace worn out bearings, interchange with existing bearings to automatically change cutting depths, or add them to bit shanks to make bits bearing guided for template or pattern work. Be sure to add the appropriate size lock collar (either #RLC14 or #RLC12) when adding bearings to bit shanks. Bearings sold per each (singles). Whiteside Machine Company - Claremont, North Carolina.
OD = Outer Diameter. ID - Inner Diameter.
3/4" OD X 1/4" ID