Generally, the motor shaft with a 14mm diameter will be inserted in one end, and a shaft, or lead screw also measuring 1/2" in diameter will be inserted into the other end. The screws that clamp the shafts will be tightened. These steel clamping coupling are for use with high torque motors and high inertia when the motor is changing directions.
14mm to 1/2" rigid coupling is intended for use with a stepper motor that has a 14mm shaft. The coupling is a clamping coupling where the coupling is tightened around the shaft using screw to tighten.
The clamping rigid coupling uses 4 screws to clamp the shafts. Each shaft is tightened with two screws each. the overall length of the coupling is 42mm. The metric inside diameter of the 1/2" end is 12.7mm. The material of this coupling is aluminum.