Support device

A support device comprising a body defining a recess in its underside, a connector to which a vacuum device can be connected, the connector and recess communicating with one another so that the vacuum device can extract air from the recess, the body further defining a passage through which a drill bit can extend, in use, at least part of the periphery of the passage serving to support the drill bit, in use, wherein the device further comprises a cover member moveably mounted upon the body, wherein the passage is provided by an opening in the body and by a generally V-shaped notch in the cover member, wherein the cover member can be positioned so as to close the passage, at least in part, so as to allow it to largely obstruct the opening when positioned for use with a smaller drill bit.