This hub has a 10mm bore, 37.0mm OD, and 10.0mm length.
Ruland supplied Controlflex couplings are a lightweight, low inertia, and zero-backlash coupling designed for use in encoders, tachometers, resolvers, and light duty power transmission applications. CntrlFlx Cplng Hub, Double, Bore 10mm, OD37. The use of two inserts allows for higher torque capacity than single insert styles.