If you have ever had to remove a bunch of large cores (up to 6”) before typically you will find it’s not a terribly pleasant job. Commonly guys will use two screwdrivers and pry the core up and then try to grab the lip and pull it out. This core extracting tool from Diamond Products Core Bore makes the job much easier and will save you a ton of time and energy. It’s such a simple design, why was this not invented years ago. The Core Extractor ($36, Ohio Power Tool) is a little pricy for what it is, but well worth it for the time it will save you.