Spektra Direkt Rotary initiate hexagonal drive motor system, which reduce the axial load of the motor shaft, extend the life of the motor, and reduce extra vibration. Each machine provides three stroke lengths (3.2 mm, 3.5 mm and 4.0 mm). They are made of space aluminum, weighing 2.8 ounces, and durable through aluminum oxidation treatment. No need of tools to disassembly, it is easy to replace the motor. The seal-designed machine body can sterilize through high temperature.