They are very similar to Combi Cutters/multiprocessors when they are equipped with concrete cutting jaws, but they are stronger in design. Concrete busters are used for very thick concrete wall structures, such as building foundations or for very tough applications, such as long front demolition where the operator has restricted visibility.
Learn more here: https://www.epiroc.com/en-us/products/excavator-attachments/concrete-busters