It can, but it will be like a hot knife through butter on drywall.
I had no problem with a cordless drill.
Much depends on the material thickness. If the pieces are securely clamped together and the bit is allowed to pilot through both pieces before the saw begins cutting, the bit won't know the difference. Ideally with few exceptions, the pilot bit should always bore all the way through the material before the saw begins cutting.
Yes it does, but you have to go slow at first. Remember it has a bit in the middle.
The allen wrench for securing the bits
It might, but you'll probably kill it
You put the mandrel into your drill then spin your saw onto the mandrel. You have to make it tight
This is a 9 Piece Milwaukee hole Dozer saw kit with five sizes including but not limited to: 1 in" -- 1-1/4 in" -- 1-1/2 in" -- 2 in" and finally a 2-1/2 in" I suggest doing your product research for the value of what you will receive with this kid as I have a little bit of buyer's remorse because I was impatient and needed to finish a job. For the same price if I had one to two days to spare I could have got double the hole saw kit bits with the secondary larger Arbor bit. This one works fine if you are in a pinch or just doing light drilling. It comes with an adapter to use the larger hole saw circular bits at typically you would use the bigger armor bit to screw onto however it becomes locked/seized on there if you are doing heavy duty drilling from the torque of your better quality Brushless Milwaukee drill.
The arbor size should fit a 6" whole saw.