https://www.zoro.com/scotch-brite-bo...37/i/G3393047/
Those should be the 3”. They’re Roloc so I just run them on an angle die grinder or anything with a Roloc adapter. I did use them on a standard drill/driver in the past while in a pinch, but once you start spinning them around 10K they kind of flare out and that’s when they become much more impressive. When you hold them in your hand you can see that all the bristles point inwards slightly. Once up to speed that’ll change a bit..