Both C and CX models are equipped with six pinwheels. In the C-52 version, these six wheels are chosen from a possible set of 12, with the number of pins on each wheel being 25, 26, 29, 31, 34, 37, 38, 41, 42, 43, 46, and 47. The C model had a fixed stepping system with a large wheel cycle due to the prime numbers of the six wheels. The CX-52 version has 6 pinwheels with 47 pins each and a flexible wheel movement system. The lug cage of both models contains 32 movable bars: 27 of the bars are used for encryption and the remaining 5 bars control the stepping of the pinwheels. The early CX models used the control bars also for encryption but due to complications in creating acceptable lug settings later CX models used these bars only for controlling of the wheel stepping. The stepping of the CX wheels was controlled by adjustable lugs on the control bars.
The C-52 and CX-52 were very flexible machines that could be produced in various ways, creating a unique machine with unique cryptographic characteristics for each customer. There were special detachable wheel movement bars and their position on the drum could change, interchangeable print wheels, custom pinwheel labels, versions with One-time Tape reader instead of wheels , versions that only enciphered numbers, and many other details that influenced the enciphering process.
The Hell 54 was a licensed copy of the C-52 by German company Hell.