YR-1-3/4-X Needle Roller Sealed Bearing 1 3/4" Inch Bore Diameter One Bearing YR-1-3/4-X Needle Roller Sealed Bearing, Bearing Inner Diameter is 1/2" Inch, Bearing Outer Diameter is 1 3/4" Inch, and Bearing is 1" Inch, it is used for heavier loads and where clevis or shaft mounting is preferred.