A knife (10) for making joining profiles in wood comprises a support part (11) provided with a bottom wall (15), a front wall (13) and a back wall (14), and a cutting part (12) provided with a plurality of blades (17) projecting from the support part (11) and each having a face (19) at the front. The knife (10) also comprises one or more threaded through holes (22) made in the support part (11) in a direction uniting the front wall (13) and the back wall (14).
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