The invention relates to a fitting tool (2) for installing a multipart clamping insert (3) in a blind rivet tool (1). In order to provide a fitting tool (2) for particularly easy and quick fitting of clamping jaws (3a, 3b, 3c) of a clamping insert (3) in a blind rivet tool (1), provision is made for the fitting tool (2) to have a main body (2a) having a mounting section (8) for magnetically fixing (11a, 11b, 11c) the clamping jaws (3a, 3b, 3c) forming the clamping insert (3).
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