An anchoring group (20) for an external fixator (1), comprising: a connecting body (11) designed to be coupled to a bar (2) of an external fixator (1), said connecting body (11) being crossed by a median plane (M) a first locking device (10) for locking first unicortical pins and connected to the connecting body (11), said first locking device (10) comprising at least one seat and a second locking device (10) for locking second unicortical pins and also connected to the connecting body (11), said second locking device (10) comprising at least one auxiliary seat, which is not aligned with the at least one seat of the first locking device (10), said first and second locking devices (10) extending from different side of said median plane (M), wherein the connecting body (11) has at least two fastening seats (110a, 110b) for each the first and the second locking devices (10) so as to allow at least two alternative mounting configurations from each side with respect to the median plane (M) of the connecting body (11).
