The 9131-M Singlemode Fiber Positioner Kit includes the high resolution high stability fiber positioner Model 9091-M, a coupler body Model 9092-M, a microscope-objective holder Model 9123NF, and adapters Model 9127NF and 9126 for mounting FC and ST connectorized fibers. An M4 threaded mounting hole allows placement on any post or pedestal in your lab.