Review on Holesaw Include Mandrels Installation Durable by Ayush Bonuccelli

They are not of very good quality. The first time I used it with 3.5" on a pine board that was only 18mm thick and less than 1" thick I was only able to get 1 full hole, on the second I couldn't finish, after a few seconds I found that the Drill did not advance, and when I looked closely, there were almost no teeth on the drill. Unfortunately I bought this bit set for one purpose only, so for a specific project and I wasn't even able to finish it. I've used other bits from other brands for the same type of wood and they did the job, but this time I was blown away by the low price. I'll keep that in mind next time. I do not recommend them. It took a long time to use them for the first time so I don't think I can return them.