A tool is provided for the exertion of a turning moment, including an indication as to whether the turning moment exceeds a set value, in which a form piece (4) with parallel rectangular surfaces turns when the turning moment attains the set value and pushes a press bolt (3) situated in the shaft (2) and an indication sleeve (6) situated outside the shaft, said indication sleeve being connected with the press bolt, towards the grip (11) so that a previously hidden part of the indication sleeve (6) with a contrasting colour becomes visible.