A tool holder or a disc-shaped working tool (18) has a working tool holding member (14) and a working tool holding counter-member (16) rotatable, together with the working tool holding member, (14) about an operational axis (A) and cooperating with the working tool holding member (14) for receiving therebetween the working tool (18) for joint rotation therewith; central securing element (26) for securing the working tool (18) between the working tool holding member (14) and the working tool holding counter-member (16); and at least one coupling element (44) associated with the working tool holding member (14), radially spaceable from the central securing element (26) and having a rotary stop for forming a releaseable plug-in connection with at least one through-bore (24) formed in the working tool (18).