Abstract: The invention relates to a reamer R comprising a base body (1) with a cutting element (2) and at least one guiding strip (3) aligned essentially axially with an abutment surface (31) and a guiding surface (32), whereby the guiding strip (3) is connected to the base body (1) in the area of the abutment surface (31). In order to be able to work different materials with a single reamer R over a long period of use of the reamer R, it is proposed according to the invention that the guiding strip (3) is formed of layered bodies (41, 42) with different materials running from the guiding surface (32) to the abutment surface (31).