Flush Trim-Plunge Router Bit | 3/8 Dia x 1/2 x 1/4in Shank
Binding Router Bearings - StewMac
uxcell 6Pcs Bearing Accessory Kit 3/16" I.D. 3/8" OD 1/8" Thick Top Mounted Bearings for Router Bit (#5-40 x 3/8" Screws): Amazon.com: Tools & Home Improvement