The shears have a connecting section (10) attached to a shaft (4) and a main plate (100) attached to a hollowed section (11). A second recess (2) is mounted to the main plate and has the cutting unit (21) attached. The recess in the cutting unit corresponds to the one in the main plate. The cutter has a nose (23) and an actuator (3) connected to a cable (15) whose end fits over a roller (31).