. Firstly it is thin as everything comes out. You can screw it in according to the instructions, but this doesn't make this BREAD HOLE GUIDE STURDY. It was a nightmare, but I managed to drill a 2 1/8 inch diameter hole. Then I tried to take the drill from the arbor, it was a nightmare. Drill bit for a 1 inch diameter saw. When I see the name Ivrine, it's not a purchase. You can be like and learn from experiences. I was inclined to believe some of the positive reviews and I was wrong.