Hole saw assembly

A hole saw assembly comprising a hole saw and an arbor for coupling said hole saw to a driving tool, said hole saw comprising a bottom wall provided with a hole with internal thread having a major and a minor thread diameter, and said arbor comprising a clamping device having a first and a second thread-engaging part,

• said first thread-engaging part extending in a longitudinal direction and having a first external surface for in use engaging the internal thread;
• said second thread-engaging part extending in said longitudinal direction and having a second external surface for in use engaging the internal thread;
• said first and second thread-engaging parts moveable with respect to one another with a component in a direction perpendicular to said longitudinal direction, allowing said first and second thread-engaging parts to displace between a first or disengaged position with respect to one another for together providing a first circumference allowing retraction from or insertion in said hole in a substantially longitudinal direction, and a second or engaged position having a second circumference that is larger than the first circumference, and in said second position said first and second external surfaces engaging said internal thread for clamping said clamping device in said hole.