The extension of the range incorporates ergonomic improvements and modularity novelties that facilitate optimisation of use on site. COMANSA adds two new models to its successful 21LC series, as an evolution of the 21LC550 model, with two options:  20 and 25 tonne maximum load, which can be assembled with ranges of between 30 and 80 metres with configurations every 5 metres, allowing a maximum point load of up to 4.95 tonne Both models incorporate an optional boom configuration that allows the total range to be extended to 85 metres at the tip.

Compared with the 21LC550 model, load capacities are on average 16% higher for the 21LC600 and 23% higher for the 21LC650. The first of the new features in these models is that they have a shorter, modular counter-jib, ranging from 24.4 to 16.4 metres and having up to 5 possible configurations.

This concept has a precedent in models 21LC750 / 21LC1050 / 21LC1400 and offers greater adaptation to the work configuration in reduced spaces. Another of the strong points of these models is the improved access to the turntable and the rotating part: the cathead has been redesigned to facilitate the passage of lifting cables, including a welded ladder that allows access to the highest part without the need for the cab platform.    

Access to the cab platform is now direct via the turntable thanks to the folding ladder, preventing falls while working on the upper level and also being easier to transport. As a standard feature, both crane models offer the double trolley system with automatic changeover (called DT in the data sheets), and incorporate, as a novelty, the optional availability of single trolley (ST) which simplifies maintenance work while increasing load capacity in short boom lengths. The height, which is self-supporting with a built-in base, can reach up to 85.8 metres.