I've had several hole-drilling kits over the years. Sometimes I forget to take the center drill out of the hole saw and over time it becomes almost impossible to get it out. This solution is unique and completely prevents this problem. They disassemble with a quick release system that also allows you to quickly eject wood material stuck in the hole saw. Watch the video provided or find the video on YouTube. They cut as well or even better than other kits I've had and store very well in the plastic carrying case that comes with them. Spend the extra on a bigger set - you won't regret it because you'll have this set for a while!