Hole saw with a drive shaft (1) which can be driven in rotation about an axis of rotation (D), a holding member (2) which has radial guides (3) and an adjusting member (4) which can be rotated relative to the holding member (2) to adjust the hole diameter, with the radial guides (3) in each case a fastening element (5) is guided and can be fastened, which is connected to a saw element (7) and a control extension (8) which is inserted into a spiral slot (9) of a setting disk (6) of the setting element, which is open to the holding element (2) (4) engages, characterized in that the control slot (9) is also open to a free space (10) of the adjusting member (4) opposite the holding member (2).
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