Abstract: An improved hole saw mandrel for use in a power drill or the like comprising an ejector mechanism which allows the operator to eject the plug that remains bound within the confines of the hole saw after the hole has been cut. The ejector mechanism is provided with rods which extend into the confines of the hole saw.In the power operated embodiments, the ejector mechanism contains a thread follower which is engagable with a thread on the mandrel shaft thereby advancing the ejector mechanism along the shaft. This advancement causes the rods to progress through the confines of the hole saw and forces out the entrapped plug. Retraction of the rods is accomplished by one of several methods. In the one, the drill rotation is reversed causing the follower to reverse its direction and withdraw the rods. In another method, the follower is disengageable allowing the ejector mechanism to be retracted manually. Still another method uses a dual direction thread with engageable followers.