YR-1-3/8-X Needle Roller Sealed Bearing 3/8" Bore Diameter One Bearing YR-1-3/8-X Needle Roller Sealed Bearing, Bearing Inner Diameter is 3/8" Inch, Bearing Outer Diameter is 1 3/8" Inch, and Bearing width is 3/4" Inch, it is used for heavier loads and where clevis or shaft mounting is preferred.