1638ZZKSK Nachi Bearing Shielded Japan 3/4" x 2x9/16" Bearing1638ZZKSK Nachi Bearing One Bearing Made in Japan 1638ZZKSK Nachi Bearing, the 1638ZZKSK inner diameter is 3 4" inch, the 1638ZZKSK outer diameter is 2" inch, 1638ZZKSK width is 9 16" inch. 1638ZZKSK Nachi Ball Bearing Nachi Deep groove Ball Bearing Closures: Double metal shields (Z ZZ 2Z) for protection against dust and debris Dimensions: 3 4" x 2" x 9 16" inch ID (inner diameter) Bore: 3 4" inch OD (outer diameter): 2" inch Width: 9 16" inch