Benchmark Abrasives 4.5" x 7/8" Premium High Density Jumbo Zirconia Type 29 Flap Discs 4 1/2 for Angle Grinder, Sanding Discs, Finishing - Grinding Wheels 4 1/2 Inch (100 Pack) - 60 Grit

Every now and again I'll come across a product here on amazon that people are raving about and it will just be a bunch of hype but in this case the hype is 100% genuine. The are hands down the best flap discs I have ever used even beating discs I paid 2x the money for. When I used these to remove 9 layers of paint from some metal parts to refinish them, I could not believe my eyes on how quickly this stripped it down to bare metal. I had to put in so little effort that I didn't even drain a dinky 4Ah M18 Milwaukee battery doing all the pieces. I am extremely pleased with this product and sad that I hadn't heard of this brand before.If you are looking for something that works well, is fast, fits well and is durable look no further this it's the best you can get.

Great item! These were used on high carbon steel and didn’t even sweat it, I am really impressed with this vendor!

I love these flap disc's. Make short work of contaminants, rust, and mil scale

I will buy these again as the price us great. There is a but of waste in longevity however. They use up fairly quickly leaving what appeared to be usable not so. Overall I give them a good review

Performance and fair price. I've used several different brands. I'll buy these again.

I recently ripped out carpet from a very old tongue and groove floor — a floor that had two decades-old layers of paint. The paint was not peeling, the tongue and groove installation was not level, and for various reasons a floor sander was not a viable option.After trying 40 grit paper with both a belt sander and a random orbital, I resorted to these flap discs on an angle grinder. The difference was stark. I am getting much better results from the discs (it's not even close) and working much faster (again, it's not even close).There are however a few caveats.First, sanding wood with these is MESSY. While the sanders have a modicum of dust collection, the angle grinder does not, and these discs spit up a LOT of sawdust. At least twenty times messier than using a sander is my estimate.Second, compared to an orbital sander or even a belt sander, sanding a large surface with an angle grinder is really hard work and requires a fair amount of hand and wrist strength.Third, an angle grinder, even with a sanding disc as opposed to a cutting wheel, is a much more dangerous tool than a sander, and sanding is really only a viable option if you remove the safety guard. So you have to use good sense and have decent skills if you want to undertake this. You'll also want to protect your eyes.Fourth, sanding your floor this way can gouge it up pretty bad very quickly, especially if you're trying to remove paint from deeper pockets, which requires more angle. If you don't want a distressed look, or if you're unwilling to spend the time to sand out gouges, this is probably the wrong tool for you.But in my case, these drawbacks were well outweighed by the benefits. I am looking to dye the floor, not paint it, and I really wanted to get the paint off, including near the edges of the grooves and other spots where my belt sander and random orbital sander really struggled to get to bare wood (and only with a lot of time investment). And given the circumstances with this floor, which is patched and was not cleanly installed to begin with, I'm perfectly happy with a little bit of a distressed look.One more advantage: if you have nails or screws you can't get out or further in (or that you just plain missed), they will rip your sandpaper to shreds. With these discs, you can easily just grind them down. (Be aware though that grinding creates a lot of sparks.)How are the discs holding up? I had about 400 square feet to sand, and I estimate I'm close to 3/4 done. I probably could have swapped more frequently; nor have I attempted any method to clean out the discs of gunk (other than banging the disc on the floor a couple times), and I just put the third disc on prior to quitting for the day. If these discs were $8 or $10 each, I'd probably be dissatisfied with that, but given the price of this pack, I'm really happy with that sort of cost–longevity ratio. In my opinion, these are giving really good value.As I indicated, not everyone will want to use these on their floors. But in the right circumstances, this is a great option.

They work good

cheap and durable. effective.