I have a cheap $25 rotary tool or dremel.

If you notice in the photo, the mandrel it comes with is just a thin rod.
The rotary wheel is held onto the mandrel with a tiny screw.
It's a hassle to attach a new wheel after one breaks.

I was told it only came with sanding wheels and not cutting wheels.
So, I need to buy cutting wheels.
I was told to buy these Dremel brand cutting wheels.

However, they do not have little circles in the middle, but some weird shape.
I think it's called EZ lock.

Does this mean I also need to get this?

Or do I need to just buy a whole new DREMEL brand dremel,
in additional to the 2 things above.

 

Also, if I want to buy the 90 degree attachment for another $20,
can I use this on any rotary tool, or just on DREMEL brand dremels?

 

My dremel is pretty old

Home Depot has 1 1/2 inch cutoff wheels with centered hole that fits 1/8 inch mandrel
If they don't have it granger does.

 

those ez-lock setups are awesome! I use my dremel a lot at work, and I was going thru a ton of those little screw down wheels. these are quite a bit stronger, and a LOT easier to replace