These roloc are just harbor freight kind. The smallest they carry are the 2" size, so improvised this mandrel from a 5/16" hex bolt. Drilled out the head, ground a shank size to 1/4" and cross drilled for a roll pin, so I could press a 2" one into it, snip the pad smaller and round it off with the bench grinder. They are listed on the package as fine 120-180 grit, but genuine 3m calls this a very fine at least they are green, colored the same, but they have a super fine, abbreviated SFN tha