It is longer than equivalent single insert Controlflex types to couple systems with wide distances between shaft ends.
. The multiple piece construction allows for a highly customizable coupling that easily combines clamp hubs with inch, metric, keyed, and keyless bores. CntrlFlx Cplng Hub, Double, Bore 15mm, OD56. 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.