3M Scotch-Brite Clean and Strip XT Pro Disc, XO-DC, SiC Extra Coarse, T27, 4-1/2 in x 5/8"-11, Silicon Carbide Cuts Aggressively and Leaves a Fine Finish, Resists Loading, Purple

[This review was collected as part of a promotion.] Wow wow wow. I really don't use strip discs very often because they typically just turn to bits of flying strip disc the first time they touch metal and just do a mediocre job. I used this to clean about a total of 25' of 2.5" square tubing and maybe 10' of other similarly sized steel. I still have pad left and removing mill scale has never been easier. I didn't damage the base metal, so even thin gauge material stays whole, but the scale just flies off with one, maybe two quick passes. The fact that it's a threaded center is just icing on the cake for me, but this thing lasts a shockingly long time, does the job incredibly well and keeps my clumsy self from gouging the base metal like I would with a flap disc or anything else. I'm going to order a whole bunch of these and stop using my flap discs for weld prep. It's rare that a new product comes along that changes my process or habit.

[This review was collected as part of a promotion.] I used this disk to shape and smooth an epoxy repair of plastic components. It performed very well making the job fast and easy. There was very little wear on the wheel so it is still available for additional jobs. I received the disk in a box of free samples from 3M.