Ed I have Rockwell's Sonicrafter Model #RK5151K and the sanding pad is 3" to each point. Rockwell's pad is 2 layers of different plastics so if the Milwaukee is also plastic, sanding an 1/8" of the corners shouldn't be an issue. Trim the sand paper and you should be good to go. I give a big thumbs up to the corded Sonicrafter, it's a beast. Since multi tools have a universal fit here's a link to the Rockwell sanding pads Here that is if you want to go that route. For some reason the pads RW8938 at Lowes are marked the same as what comes with the Sonicrafter while the same model number at Amazon and Homedepot show different specs