Benefits: Comes with an extra drill bit so you can drill a pilot hole first and then cut a large hole on either side. out of the hole when the incision was complete. Cons: I have a drill that locks the chuck when you release the trigger. Since this hole saw has no locking mechanism (the cutter only rotates onto the thread), every time I release the trigger, the cutter slips off the threaded shaft and flies in a random direction. Very dangerous so be careful and wear gloves! It also ruined an expensive piece of wood in a project that was almost complete.