"R6" ABEC 5 bearing. Best all steel bearing for wheel hubs.

DIMENSIONS ....... 3/8" x 7/8" x 9/32"
SEALS ...... "Snap Ring Seal" or "LLB"
BALL MATERIAL .....Chromium Steel
BALL GRADE ............... 5
RACES ........ Chromium Steel
APPLICATION .... Wheel Hub
GREASE ... Realube Bearing Compound