The invention relates to a fixing screw comprising a threaded longitudinal body (10) extending between a head (12) for driving it in rotation and a point-forming end (14) adapted to be inserted into a support. Said threaded longitudinal body (10) includes at least one break point (16) enabling said threaded longitudinal body (10) to be broken forcibly at said break point (16) in order to remove a portion (20) of said longitudinal body (10) extending from said break point (16) to said point-forming end (14), whereby said screw can be shortened prior to use.
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