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NBK Japan MJB-65-BL 16mm to 35mm Jaw-type Flexible Coupling three sixteenths bore the inner diameter(bore) is 1/2"NBK Japan MJB 65 BL 16mm to 35mm Jaw type Flexible Coupling NBK Japan MJB 65 BL 16mm to 35mm Jaw type Flexible Coupling NBK Japan MJB 65 BL 16mm to 35mm Jaw type Flexible Coupling, this is a Jaw type flexible coupling. The bellows allows eccentricity, angularmisalignment, and end play. Coupling Bore 1 Diameter: 16mm Coupling Bore 2 Diameter: 35mm Coupling Length: 90 Coupling Outer Diameter: 65 Material: Stainless This is a jaw type flexible coupling.