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NBK Japan MJC-65CSK-EWH 11/16"inch to 24mm Jaw-type Flexible Coupling ABEC-7 Bicycle Bearing NBK Japan MJC-55K-BL 1/2 inchNBK Japan MJC 65CSK EWH 11 16 inch to 24mm Jaw type Flexible Coupling NBK Japan MJC 65CSK EWH 11 16 inch to 24mm Jaw type Flexible Coupling NBK Japan MJC 65CSK EWH 11 16 inch to 24mm Jaw type Flexible Coupling, this is a Jaw type flexible coupling. The bellows allows eccentricity, angularmisalignment, and end play. Coupling Bore 1 Diameter: 11 16 inch Coupling Bore 2 Diameter: 24mm Coupling Length: 90 Coupling Outer Diameter: 65 Material: Stainless