Drilling saw with a rotary axis (D) drive unit (1),a holding joint (2),has radial conductivity (3) and a relatively rotating adjusting member relative to the holding joint (2) to adjust the hole diameter (4),where, in the radial conductors (3), a fixing element (5) is guided and fixable, which is connected to a saw element (7) and a control extension (8), which intervenes in a spiral slot (2) open to the holding position (9) of an adjustment disc (6) of the adjustment element (4), characterized by the fact that the control slip (9) also is open to a free space (10) of the adjusting member (4) opposite the holder joint (2).
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