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

These purple silicon carbide discs absolutely eat mill scale. I used it today fit the first time but it removed rusty mill scale nearly instantly and showed no signs of loading up. Any other disc, sander or abrasive would have been glossing over the surface by the time I finished what I did today.I'm teaching myself to weld, these were a great find. I'll still use vinegar for longer prep times, but these are a great alternative that gives instant results.For stripping steel to a clean surface I definitely recommend these.

For those who are tired of black scuff marks (actually, I beleive it is a stain from the chemistry of the metal), this works great. Although pricey compared to most crud removers, it has saved alot of time in making the SS cosmetically nice instead of revealing that a DIYer like me did the fabrication. Regarding the price, it looks like it will last a while - we'll see.

This does an awesome job removing mill scale. If I were a woman, I would find the engineer who came up with this and I would marry him.

I'm taking a TIG welding class, and we have carbon steel coupons and they come with mill scale, it cleans the mill scale like nothing with no pressure, but this thing that cost around $16.00 just last me one class, the semester is just starting. For constant use isn't worthy. That would be $64.00 a month, by 5 months. Works good, but too expensive for what it is, the cheaper brand that probably will last the same is just $25.00 for 10 discs.

These discs rip. Like others said they remove mill scale so well. They also do a great job not removing hardly any base metal. The one thing they don’t love is edges. Obviously it cuts some of the disc off so be mindful. Yes they are expensive but so are are the 10-15$ Black useless strip discs others sell.. lasts quite awhile. And time is money these sure save me from getting pelted by wire wheels.

All I can say is WOW!!! These things are awesome. As you can see I used them to take mill scale off of 5”x5”x8’ steel. One disc got four of them 8 footers done plus a couple of small things. Them cheap ones won’t even take the mill scale off. So from now on these are the only ones I’m buying

This wheel removed mill scale with little effort.

It’s actually a really nice product to use for removing milk scale, but based on how quickly it wears out, it really should be in the $5-7 range to be competitive with competing options. I think this will be an occasional specialty use disc in our shop, but it’s simply too price prohibitive to be a daily disc.