The Right Tool: Hole Saw with Eject.
Hole saws
I’ve been using normal hole saws for years and the biggest headache I have is removing the core from the saw. I was just watching a video and this guy sawed/drilled a hole and then boom! He ejected it!
Watch here.
The Product is the Spyder Hole Saw Kit. I haven’t tried it, and I already have a good selection of hole saws, so I probably won’t buy it, but I’m writing about it in case I need to buy new hole saws in the future.

They thought of a few things that I didn’t even think of – the ability to cut a bigger hole over an existing. Check out their video.